Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
thanh tan » thanh toan, thanh tuan, thanh san
dong cong » duong cong, dung cong, dang cong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than van » thanh van, tran van, phan van
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (toc thieu)) sang - thanh tan van dong cong tac than van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sang - thanh tan van dong cong tac than van.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (toc thieu)) sang - thanh tan van dong cong tac than van*.