# Page Not Found

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

## Suggested Pages

You may be looking for one of the following:
- [Chỉnh sửa, Xoá học viên ra khỏi lớp](https://ems.help.dotb.vn/dang-ki-hoc-va-thu-tien/chinh-sua-xoa-hoc-vien-ra-khoi-lop.md)
- [Chăm sóc học viên trong lớp](https://ems.help.dotb.vn/cham-soc-hoc-vien/cham-soc-hoc-vien-trong-lop.md)
- [Cập nhật lịch nghỉ lễ trong năm](https://ems.help.dotb.vn/bo-phan-giao-vu/cap-nhat-lich-nghi-le-trong-nam.md)
- [TICKET SUPPORT](https://ems.help.dotb.vn/ticket-support.md)
- [Upload file Giáo viên/Trợ giảng](https://ems.help.dotb.vn/khoi-dau-he-thong/x-li-master-data/upload-file-giao-vien-tro-giang.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://ems.help.dotb.vn/dang-ki-hoc-va-thu-tien/chinh-sua-xoa-hoc-vien-ra-khoi-lop.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://ems.help.dotb.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://ems.help.dotb.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., `/dang-ki-hoc-va-thu-tien/chinh-sua-xoa-hoc-vien-ra-khoi-lop.md`).

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