Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
tranh xuan » tran xuan, thanh xuan, trinh xuan
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan lap
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 - canh ((tranh xuan) OR (tranh luan)) hang cong tan ((phan cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh ((tranh xuan) OR (tranh luan)) hang cong tan ((phan cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh ((tranh xuan) OR (tranh luan)) hang cong tan ((phan cau) or (phan tu))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh ((tranh xuan) OR (tranh luan)) hang cong tan ((phan cau) or (phan tu))*.