Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu tinh » chieu tinh, lieu tinh, kieu tinh
va phuong » va thuong, cac phuong
va thong » va thuong, he thong, va cong
cong dan » cong san, cong tan, huong dan
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha tap
co hieu » cao hieu, doc hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: co hieu tinh - thanh tung ((va thong) OR (va phuong)) cong dan ((than tap) OR (phan tap))~.
• Adding a wildcard symbol may retrieve word variants: co hieu tinh - thanh tung ((va thong) or (va phuong)) cong dan ((than tap) or (phan tap))*.