Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
luan phung » luan phuong, luan chung, luan phong
bien tinh » bi tinh, yen tinh, diep tinh
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than tap » toan tap, han tap, phan tap
so bien » mot bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so bien tinh - thanh dung luan phung ((cong dan) or (cong san)) than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - thanh dung luan phung ((cong dan) OR (cong san)) than tap*.