Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
hieu quang » thieu quang, hieu qua, diep quang
tac thuong » tai thuong, tam thuong, tac thong
hieu quan » hieu qua, lieu quan, thien quan
cong tac » cong ty
cong tan » cong san, cong thanh, cong ty
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu quang) or (hieu quan)) - thanh cong tac thuong cong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (hieu quan)) - thanh cong tac thuong cong tan tran cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quang) or (hieu quan)) - thanh cong tac thuong cong tan tran cau*.