Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
hoi hieu » hoi phieu, hoi tieu, moi hieu
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu quan - hanh ((trung cua) or (tang cua)) nhung ((cong dan) or (cong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu quan - hanh ((trung cua) OR (tang cua)) nhung ((cong dan) OR (cong tan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoi hieu quan - hanh ((trung cua) or (tang cua)) nhung ((cong dan) or (cong tan)) toan cao*.