Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung quan » truong quan, trong quan, trung tuan
quan nhung » qua nhung, cua nhung, luan chung
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
tranh cac » trinh cac, thanh cac, tranh cai
thanh bac » nhanh bac, thanh bai, thanh san
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh

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 quan - thanh trung quan nhung cong tan ((tranh cac) or (thanh bac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu quan - thanh trung quan nhung cong tan ((tranh cac) OR (thanh bac)).
• Adding a wildcard symbol may retrieve word variants: doc hieu quan - thanh trung quan nhung cong tan ((tranh cac) or (thanh bac))*.