Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu cach » hieu cac, chieu sach, hieu ca
trung cap » truong cao, trung tam
hoc hieu » hoc thieu, hoc hien, doc hieu
cap hang » cap hoang, cap bang, cap han
cong tac » cong ty
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - thanh trung cap hang ((cong san) or (cong tac)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - thanh trung cap hang ((cong san) OR (cong tac)) phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh trung cap hang ((cong san) or (cong tac)) phan dau*.