Perhaps you should try some spelling variations:
tuong cong » truong cong, trong cong, tong cong
cong thanh » dong thanh, cong trinh, cong tan
hieu cach » hieu cac, chieu sach, hieu ca
trung van » truong van, trong van, trung va
trung cap » truong cao, trung tam
doc hieu » toc thieu, hoc thieu, hoc hien
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: doc hieu cach - thanh ((trung van) or (trung cap)) tuong cong thanh san cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu cach - thanh ((trung van) OR (trung cap)) tuong cong thanh san cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu cach - thanh ((trung van) or (trung cap)) tuong cong thanh san cau*.