Perhaps you should try some spelling variations:
cong thuong » hang thuong
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
nang quan » ban quan, nang suat
ban thanh » ban hanh, ban hang
hoi hieu » hoi phieu, hoi tieu, moi hieu
dan toan » van toan, dan than, manh toan
tung va » trung va, tuong va, dung va

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 lang - thanh tung va ((nang quan) or (cong thuong)) ((dan toan) or (ban thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - thanh tung va ((nang quan) OR (cong thuong)) ((dan toan) OR (ban thanh)) cau.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - thanh tung va ((nang quan) or (cong thuong)) ((dan toan) or (ban thanh)) cau*.