Perhaps you should try some spelling variations:
thanh tung » thanh cong
cong thanh » dong thanh, cong trinh, cong tan
hieu tinh » chieu tinh, lieu tinh, kieu tinh
can bang » cao bang, van ban, von bang
co hieu » cao hieu, doc hieu
can ban » van 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 (can bang)) cong thanh san cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co hieu tinh - thanh tung ((can ban) OR (can bang)) cong thanh san cau.
• Adding a wildcard symbol may retrieve word variants: co hieu tinh - thanh tung ((can ban) or (can bang)) cong thanh san cau*.