Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, truong thanh
hieu tinh » chieu tinh, lieu tinh, kieu tinh
cong tan » cong tac, cong san, cong ty
co hieu » cao hieu, doc hieu
can ban » toan ban
san cau » van cau, ban cau, can cau

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

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