Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
hieu lang » chieu sang, hieu quang, nhieu tang
luan dang » luan nang, luan danh, luan dong
dang cong » dung cong
son nhanh » son thanh, hon nhanh, hoc nhanh
hong hanh » dong thanh, cong thanh, hong ha
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 luan dang cong ((son nhanh) or (hong hanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh tranh luan dang cong ((son nhanh) OR (hong hanh)) cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh tranh luan dang cong ((son nhanh) or (hong hanh)) cau*.