Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
hieu manh » chieu xanh, hieu nganh, dieu hanh
lang cong » dang cong, bang cong, hang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
tran van » luan van
van lang » van nang, va lang, van hang
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - thanh tran van lang cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh tran van lang cong ((tac toan) OR (tam toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh tran van lang cong ((tac toan) or (tam toan)) cao*.