Perhaps you should try some spelling variations:
tranh thong » tran thong, tranh trong, trinh thong
chung cong » nhung cong, chong cong, phung cong
ban thanh » ban hanh, ban hang
thanh bac » nhanh bac, thanh bai, thanh san
doc hieu » toc thieu, hoc thieu, hoc hien
thong tu » phong tuc, thong tin, thong ke
tu chung » tu vung, tu cong
cong ban » cong bang, cong san, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (mot chieu)) sang - tranh thong tu chung cong ban thanh bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (mot chieu)) sang - tranh thong tu chung cong ban thanh bac.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (mot chieu)) sang - tranh thong tu chung cong ban thanh bac*.