> For the complete documentation index, see [llms.txt](https://info.ehs.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://info.ehs.vn/chinh-sach-ban-hang/elearning-dao-tao-truc-tuyen-1/dang-nhap/chung-nhan-chung-chi.md).

# Chứng nhận chứng chỉ

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