Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh dang » hanh dong, anh dang, hanh dung
binh cong » binh cuong, minh cong, sinh cong
dang van » hoang van, hang va
van binh » van minh, van dinh, van linh
cong tan » cong tac, cong san, cong thanh
van chat » cao chat
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)) sach - hanh dang van binh cong tan van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (toc thieu)) sach - hanh dang van binh cong tan van chat*.