Perhaps you should try some spelling variations:
truong trung » tieng trung
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh luan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac
ho hieu » ho chieu, hoi hieu, nho hieu

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 - hanh ((trinh cua) OR (trinh quan)) ((nhung cong) or (truong trung)) dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((trinh cua) OR (trinh quan)) ((nhung cong) OR (truong trung)) dan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh ((trinh cua) OR (trinh quan)) ((nhung cong) or (truong trung)) dan than cap".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((trinh cua) OR (trinh quan)) ((nhung cong) or (truong trung)) dan than cap*.