Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
luan doan » luan hoan, quan doan, luat doanh
lang cong » bang cong, hang cong, lang dong
dang cong » dung cong
toc hieu » toc thieu, doc hieu, hoc thieu
doan van » doan va, hoang van, luan van
van phan » van phong, van thanh, luan phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu manh - luan doan van ((lang cong) or (dang cong)) van phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu manh - luan doan van ((lang cong) OR (dang cong)) van phan tu*.