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ROSI LAW — AI Legal Assistant

A chat window right on rosiai.vn that answers questions about registering security interests, based on a store of legal texts loaded into it.

Open the software See the other eight guides

1Who it is for

  • Registry officers handling security interests who need to look up a procedure, a required document or a fee quickly.
  • Credit officers at banks and lending institutions preparing mortgage files.
  • Members of the public and businesses finding out for the first time how to register a mortgage over movable property or a vehicle.
  • Visitors to rosiai.vn who want to test what the system can do before getting in touch.
  • English-speaking users: the English version of the site has the same chat window, and the assistant answers entirely in English.

2How to open it

Open https://rosiai.vn/ in any browser. No login, no account needed.

There are two ways to open the chat window:

  1. The round blue button in the bottom right corner of the screen (a speech-bubble icon, labelled "Ask the AI" for screen readers). It floats above the page wherever you scroll.
  2. Or press any of the assistant buttons spread across the home page:
  • "Ask the AI" — in the top bar.
  • "Ask the AI a question" — in the introduction block at the top.
  • The large search box "Ask the AI about procedures, legal rules..." — the whole box is clickable.
  • The "AI Legal Assistant" tile in the row of shortcuts.
  • "Try a question" in the services section, and "Try the AI" further down the page.
  • In the footer: "AI Legal Assistant" and "Ask the AI".

The chat window opens with the title "RosiAI – Legal Assistant", the subtitle "Artificial Intelligence Systems", and a blinking green dot showing it is live.

On a phone (screens narrower than 481 px) the chat window fills the whole screen and the round button sits in the bottom right corner. On a computer it is a floating panel of roughly 420 × 640 px; you can drag the blue title bar to move the window so it does not cover the page behind it.

On the Vietnamese version of the site the same buttons read "Hỏi trợ lý AI", "Trợ lý pháp lý AI" and "Hỏi thử ngay".

3Everyday tasks

Asking a legal question

  1. Press the round button in the bottom right corner, or press "Ask the AI".
  2. Read the assistant's greeting (Hello! I am RosiAI...).
  3. Click the "Enter your question..." box at the bottom of the chat window.
  4. Type your question, for example: What documents are needed to register a mortgage over a car?
  5. Press Enter to send, or press the arrow "Send" button to the right of the box. To start a new line inside your question, press Shift + Enter.
  6. Wait for the three blinking dots; the answer then appears word by word.
  7. Let the answer finish before reading it — bold text and bullet points are only laid out correctly once it is complete.

Using the ready-made suggestions

  1. Open the chat window.
  2. Just above the input box there are four suggestion cards you can press:
  3. Press one. The question is sent straight away; you type nothing.
  4. Once sent, the suggestion cards disappear to make room for the conversation.
  5. To see the four cards again, press the "New chat" button (the plus sign) at the top of the chat window.

"How to register a mortgage?"

"What are the registration fees?"

"What documents are required?"

"How long does processing take?"

On the Vietnamese version the four cards read "Cách đăng ký thế chấp?", "Phí đăng ký bao nhiêu?", "Hồ sơ cần gì?", "Thời gian xử lý?".

Uploading a file and asking about what is in it

  1. In the chat window, press the paperclip button to the left of the input box (labelled "Attach file").
  2. Choose a file from your device. The system accepts only .pdf, .doc, .docx, .txt, up to 20 MB.
  3. The file name appears in a grey box just above the input box. To drop the file, press the red × at the end of that box ("Remove file").
  4. Type your question about the file, for example: Which mandatory clauses are missing from this contract under Decree 99/2022?
  5. Press Enter. The assistant extracts the text from the file first and then answers; your message shows a paperclip icon and the file name.
  6. Note: the system reads only the beginning of the file (about 8,000 characters are extracted, and only about the first 2,000 are sent with your question). For a long document, cut out the part you want to ask about into a small .txt file.
  7. A PDF that is only a scanned image (no text layer) cannot be read — the assistant will answer as if there were no file.

Following up in the same thread

  1. After an answer, simply type your next question in the input box.
  2. Short follow-ups work: And for a motorbike?, How much is the fee? — the assistant knows you are still on the same subject.
  3. The assistant remembers the last 10 exchanges in the same conversation.
  4. If you switch to a completely different subject, write the question out in full rather than leaving it short.
  5. To cut the thread entirely, press "New chat" and start again.

Copying an answer out

  1. Wait until the answer has finished completely (no blinking cursor at the end of the line).
  2. Select the text with the mouse. On a phone: press and hold, then drag the two selection handles.
  3. Press Ctrl + C (computer) or choose "Copy" (phone).
  4. Paste into Word, an email or your own software with Ctrl + V.
  5. The chat window has no separate "Copy" button — selecting the text is the only way.
  6. Before putting anything into an official document, check it against the original legal text.

Starting a new conversation

  1. At the top of the chat window there are three small buttons: a clock ("History"), a plus sign ("New chat") and an × ("Close").
  2. Press the plus sign, "New chat".
  3. The chat is cleared, and the greeting and the four suggestion cards come back.
  4. The old conversation is not deleted from the server, but you will not see it again in the chat window.

Reopening an old conversation

  1. Press the clock button ("History") at the top of the chat window.
  2. A panel slides out titled "Conversation history", with a "+ New conversation" button and a "Back" button.
  3. Press a row in the list to reopen that whole exchange.
  4. To delete one, hover over the row and press the × at the end; the system asks "Delete this conversation?" — press OK.
  5. Important: the history list covers the chat sessions of every visitor, so the server only returns it to a signed-in administrator. An ordinary visitor pressing "History" sees an empty panel.
  6. Also, every time you reopen the chat window the system starts a new conversation; it does not restore an unfinished one. Copy out any answer you want to keep before closing the window.

Asking in Vietnamese

  1. At the top of the page, switch to the Vietnamese version of the home page.
  2. Press "Hỏi trợ lý AI" or the round button in the bottom right corner.
  3. The chat window changes its title to "RosiAI – Trợ lý Pháp lý".
  4. Type your question in Vietnamese and press Enter — the assistant answers entirely in Vietnamese, under the same rules as the English version.

4How to ask a good question

  • Name the asset and what you need to do. A good question: Which form do I file to register a mortgage over a car? A vague one: How do I register?
  • Name the decree, circular or article when you already know it. A good question: What are the conditions for cancelling a registration under Decree 99/2022/ND-CP? The assistant gives priority to the rules currently in force and will say so if different texts disagree.
  • When asking about money, use the word "fee", "charge" or "rate". The store includes Circular 61/2023/TT-BTC on fees; the right word helps the assistant find the right passage.
  • No need to labour the type of vehicle. The system understands that "car", "motorbike", "lorry" and "van" are all road motor vehicles; that "boat" and "vessel" are inland waterway craft; and that "file" means the documents to be submitted.
  • One question at a time. Four questions in a single message often means the assistant answers only some of them.
  • Ask with the real situation attached. A good question: The mortgagor changed its company name after registering — what procedure applies? A vague one: What about changes?

5Tips and common problems

  • "Sorry, your question is outside the scope..." appears when the document store holds nothing relevant, or the question is too general. The assistant is built to answer only from the texts loaded into it, never to guess from outside knowledge. Ask again more precisely, or name the legal text.
  • An answer appearing word by word is normal — that is live streaming. Do not press send again while it runs; the "Send" button dims until it finishes.
  • A file will not upload: check the extension is .pdf/.doc/.docx/.txt and the size is under 20 MB. The wrong format gives "Only PDF, DOCX, TXT accepted". If it still fails, paste the passage straight into the input box.
  • "Too many requests. Please try again in 15 minutes." means you — or your office network sharing one IP address — sent more than 50 messages in 15 minutes. Wait, then ask again.
  • "⚠️ Connection lost. Check your network and try again." or "AI connection error. Please try again." — check the network, reload the page and ask again. Anything half-typed is lost.
  • Press Esc to close the chat window quickly. Pressing the round button reopens it, but as a new conversation.

6Frequently asked questions

Do I have to sign in or pay to use the assistant?

No. The chat window is open to every visitor to rosiai.vn. Only the site's administration area needs a login.

Can the assistant replace formal legal advice?

No. It is a look-up tool that summarises quickly from the texts loaded into it. Before making a decision or preparing a file, you must check the original legal texts (Decree 99/2022/ND-CP, Decree 21/2021/ND-CP, Circular 61/2023/TT-BTC and so on) and, where needed, ask the competent registry.

Where does the assistant get its information?

From the system's own document store: decrees, circulars, forms and guidance material on registering security interests. The assistant is instructed to use only this source, not to name files, and not to add outside knowledge.

Where do I file a registration?

The assistant will point you to the Ministry of Justice's online registration portal for security interests: https://dktructuyen.moj.gov.vn — that portal is not part of RosiAI.

Who do I contact for help from a person?

Telephone 0903 656 563, email rosi@rosiai.vn, website rosiai.vn. If you ask the assistant how to get in touch, it gives the same details.