Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung lung » trung dung, trung hung, trung long
lung nhung » dung nhung, ung nhung, dung chung
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hieu van » hieu va, thien van, lieu va
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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 lang) or (hieu van)) - thanh trung lung nhung cong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (hieu van)) - thanh trung lung nhung cong dan than cap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (hieu van)) - thanh trung lung nhung cong dan than cap*.