Perhaps you should try some spelling variations:
tranh luat » trinh luat, tranh luan, trinh luan
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
luat hang » luat hanh, luat chung, luat huong
hang cong » dang cong, hang nong, bang cong
cong luan » tong luan, cong tuan, dong luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu lang)) - canh tranh luat hang cong luan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - canh tranh luat hang cong luan van ban*.