Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
hoc tang » hoc bang, hoc tieng, hoc trong
cong tam » cong tac, cong tan, cong nam
tam than » ban than
than cau » toan cau, phan cau, than cap
ho hieu » ho chieu, hoi hieu, nho hieu
hoc tan » hoc dan, hoc tap, hoc tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh trung ((hoc tang) or (hoc tan)) cong tam than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh trung ((hoc tang) OR (hoc tan)) cong tam than cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh trung ((hoc tang) or (hoc tan)) cong tam than cau*.