Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
luat trong » suat trong, thuat trong, luat thuong
hieu lang » chieu sang, hieu quang, nhieu tang
cong van » cong vang, song van, cong tan
cong san » cong tac
hang dau » hang va, hang tai
ho hieu » ho chieu, hoi hieu, nho hieu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh trinh luat trong ((cong van) OR (cong san)) hang dau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh trinh luat trong ((cong van) OR (cong san)) hang dau*.