Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
nang quan » ban quan, nang suat
dung cong » dung trong
nang qua » nang dua, nang cua, nang quy
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, hoi hieu, nho 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 (doi chieu)) lang - anh ((nang qua) or (nang quan)) dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (doi chieu)) lang - anh ((nang qua) OR (nang quan)) dung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (doi chieu)) lang - anh ((nang qua) or (nang quan)) dung cong dan than cau*.