Perhaps you should try some spelling variations:
thong lang » thuong lang, thong mang, thong nang
tac thong » tac thuong, tac trong, tac chong
toc hieu » doc hieu, hoc thieu, thuc hieu
cong tac » cong ty
lang van » dang van, tang van, hoang van
van phan » van phong, van thanh, luan phan
phan cap » phan lap, phan tap, phan cac

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) or (toc thieu)) cach - thanh cong tac thong lang van phan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc hieu) OR (toc thieu)) cach - thanh cong tac thong lang van phan cap*.