Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
hieu lang » chieu sang, hieu quang, nhieu tang
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
son nhanh » son thanh, hon nhanh, hoc nhanh
hong hanh » dong thanh, cong thanh, hong ha
nho hieu » nha hieu, nho sieu, nhu hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu lang - canh tranh luan nang cong ((son nhanh) or (hong hanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu lang - canh tranh luan nang cong ((son nhanh) OR (hong hanh)) cau.
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - canh tranh luan nang cong ((son nhanh) or (hong hanh)) cau*.