# Page Not Found

The URL `files/veC4GKVxHkWez70bf1dj` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [CSS Background](https://docs.quangkhoi1228.com/css/css-background.md)
- [CSS Flexbox](https://docs.quangkhoi1228.com/css/css-flexbox.md)
- [Chức năng tìm kiếm với JS và DOM](https://docs.quangkhoi1228.com/javascript/chuc-nang-tim-kiem-voi-js-va-dom.md)
- [Class 11: Project 4: Xử lý form data](https://docs.quangkhoi1228.com/lap-trinh-reactjs/class-11-project-4-xu-ly-form-data.md)
- [Class 01: Giới thiệu ReactJS](https://docs.quangkhoi1228.com/lap-trinh-reactjs/class-01-gioi-thieu-reactjs.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.quangkhoi1228.com/css/css-background.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.quangkhoi1228.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://docs.quangkhoi1228.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., `/css/css-background.md`).

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