Perhaps you should try some spelling variations:
thanh trung » thanh tung
quan nhung » qua nhung, cua nhung, luan chung
hieu lang » chieu sang, hieu quang, nhieu tang
qua chung » qua chuong, quat chung, cua chung
nho hieu » nha hieu, nho sieu, nhu hieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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: nho hieu lang - thanh trung ((quan nhung) or (qua chung)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - thanh trung ((quan nhung) OR (qua chung)) cong tac toan cau*.