Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien tach » thien hach, chiet tach, vien bach
cua dang » cua cong, cua ban
qua dung » quang dung, su dung, qua song
cong san » cong tac
san tuan » van tuan, san luan, san quan
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien tach - thanh trung ((cua dang) or (qua dung)) cong san tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - thanh trung ((cua dang) OR (qua dung)) cong san tuan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - thanh trung ((cua dang) or (qua dung)) cong san tuan cau*.