Perhaps you should try some spelling variations:
thieu quan » thieu quang, thien quan, hieu qua
thanh tung » thanh cong
hieu quan » hieu qua, lieu quan, thien quan
tung cua » trung cua, tuong cua, dung cua
ban cong » bang cong, van cong, phan cong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap

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

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