Perhaps you should try some spelling variations:
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
nang qua » nang quan, nang dua, nang cua
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
ho hieu » ho chieu, nho hieu, co hieu

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

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