Perhaps you should try some spelling variations:
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
anh nang » ganh nang, anh bang, anh dang
nang dua » nang du, nang suat, nang quan
dua dung » duc dung, duy dung, qua dung
cong tan » cong tac, cong san, cong thanh
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap
co hieu » cao hieu, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co hieu) or (hoi hieu)) lang - anh nang dua dung cong tan ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co hieu) OR (hoi hieu)) lang - anh nang dua dung cong tan ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: ((co hieu) or (hoi hieu)) lang - anh nang dua dung cong tan ((than cau) or (toan cau))*.