Perhaps you should try some spelling variations:
thanh anh » thanh binh, thanh san, hinh anh
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, doc hieu, hoc dieu
cong tan » cong tac, cong san, cong thanh
tran van » luan van
va hang » van hang, va nang, va lang
anh va » hanh va

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) or (hoc hien)) manh - thanh anh va hang cong tan tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc hien)) manh - thanh anh va hang cong tan tran van.
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc hien)) manh - thanh anh va hang cong tan tran van*.