Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
dang thanh » dong thanh, dang hanh, hoang thanh
hieu lang » chieu sang, hieu quang, nhieu tang
doi hieu » doi chieu, doc hieu, doi hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - canh tranh luan ((nhung cong) or (thong cong)) dang thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - canh tranh luan ((nhung cong) OR (thong cong)) dang thanh san*.