Perhaps you should try some spelling variations:
thanh trung » thanh tung
tac thanh » bac thanh, cac thanh, tcc thanh
thanh cau » thanh chau, thanh mau, nhanh cau
nho hieu » nha hieu, nho sieu, nhu hieu
hoc tang » hoc bang, hoc tieng, hoc trong
cong tac » cong ty
ho hieu » ho chieu, hoi hieu, co hieu
hoc tan » hoc dan, hoc tap, hoc tai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (nho hieu)) quang - thanh trung ((hoc tang) OR (hoc tan)) cong tac thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) OR (nho hieu)) quang - thanh trung ((hoc tang) or (hoc tan)) cong tac thanh cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) OR (nho hieu)) quang - thanh trung ((hoc tang) or (hoc tan)) cong tac thanh cau*.