# Page Not Found

The URL `files/-M_-xpKA21_CIpN2y3r1` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [22. Tại sao tôi không nhận được tin nhắn của Instagram](https://how.doopage.com/faq-1/faq/22.-tai-sao-toi-khong-nhan-duoc-tin-nhan-cua-instagram.md)
- [3. Làm sao để tôi có thể phân biệt được inbox và comment trên DooPage?](https://how.doopage.com/faq-1/faq/3.-lam-sao-de-toi-co-the-phan-biet-duoc-inbox-va-comment-tren-doopage.md)
- [Các thao tác trên app điện thoại](https://how.doopage.com/thao-tac-danh-cho-nhan-vien/tu-van-khach-hang-tren-dien-thoai.md)
- [23. Xử lý khi gặp các mã lỗi khi gửi tin nhắn qua Fanpage](https://how.doopage.com/faq-1/faq/23.-xu-ly-khi-gap-cac-ma-loi-khi-gui-tin-nhan-qua-fanpage.md)
- [Hướng dẫn sử dụng DooPage](https://how.doopage.com/master.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

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

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

```
GET https://how.doopage.com/faq-1/faq/22.-tai-sao-toi-khong-nhan-duoc-tin-nhan-cua-instagram.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://how.doopage.com/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://how.doopage.com/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., `/faq-1/faq/22.-tai-sao-toi-khong-nhan-duoc-tin-nhan-cua-instagram.md`).

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