# Page Not Found

The URL `files/OtF9ovHwpDhWuCbhYfxr` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [4.4 Phiếu mua hàng](https://docs.sandbox.com.vn/4.-ke-toan/4.4-phieu-mua-hang.md)
- [1. Tại sao lên đơn ở màn Thu ngân không áp dụng được Khuyến mãi?](https://docs.sandbox.com.vn/thu-vien-cau-hoi/1.-tai-sao-len-don-o-man-thu-ngan-khong-ap-dung-duoc-khuyen-mai.md)
- [4.5 Phiếu bán hàng](https://docs.sandbox.com.vn/4.-ke-toan/4.5-phieu-ban-hang.md)
- [Cho phép phân bổ đơn cho marketing](https://docs.sandbox.com.vn/2.-sale/2.1-telesales/cho-phep-phan-bo-don-cho-marketing.md)
- [4.6.3 Thu chi](https://docs.sandbox.com.vn/4.-ke-toan/4.6-danh-muc/4.6.3-thu-chi.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://docs.sandbox.com.vn/4.-ke-toan/4.4-phieu-mua-hang.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://docs.sandbox.com.vn/sitemap.md

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

### Option 3 — Retrieve the full documentation corpus

Full export: https://docs.sandbox.com.vn/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., `/4.-ke-toan/4.4-phieu-mua-hang.md`).

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