# Page Not Found

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## Suggested Pages

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- [Download cuốn sách luyện thi B2 VSTEP 4 kỹ năng PDF](https://vstepvietnam.gitbook.io/b2/download-cuon-sach-luyen-thi-b2-vstep-4-ky-nang-pdf.md)
- [Hướng dẫn luyện nghe tiếng Anh B2 VSTEP với đề thi thật](https://vstepvietnam.gitbook.io/b2/huong-dan-luyen-nghe-tieng-anh-b2-vstep-voi-de-thi-that.md)
- [Chứng chỉ tiếng anh B2 là gì? Học và thi B2 ở đâu uy tín?](https://vstepvietnam.gitbook.io/b2/chung-chi-tieng-anh-b2-la-gi-hoc-va-thi-b2-o-dau-uy-tin.md)
- [Download sách tiếng anh B2 miễn phí PDF](https://vstepvietnam.gitbook.io/b2/download-sach-tieng-anh-b2-mien-phi-pdf.md)
- [Download tài liệu ôn thi B2 tiếng Anh miễn phí](https://vstepvietnam.gitbook.io/b2/download-tai-lieu-on-thi-b2-tieng-anh-mien-phi.md)

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### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://vstepvietnam.gitbook.io/b2/download-cuon-sach-luyen-thi-b2-vstep-4-ky-nang-pdf.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://vstepvietnam.gitbook.io/b2/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://vstepvietnam.gitbook.io/b2/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/b2/download-cuon-sach-luyen-thi-b2-vstep-4-ky-nang-pdf.md`).

You may also use `Accept: text/markdown` header for content negotiation.