Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
tran van » luan van
van dung » van dong, xay dung, tin dung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu tinh) or (kieu tinh)) - thanh tran van dung ((cong tan) OR (cong san)) khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - thanh tran van dung ((cong tan) OR (cong san)) khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu tinh) or (kieu tinh)) - thanh tran van dung ((cong tan) OR (cong san)) khan cap".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (kieu tinh)) - thanh tran van dung ((cong tan) OR (cong san)) khan cap*.