Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
tinh cua » trinh cua, sinh cua, tinh chat
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cao » toan cao, thai cao, than cap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((((trinh quan) OR (trinh han))) OR (tinh cua)) hang cong tan than cao~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((((trinh quan) or (trinh han))) or (tinh cua)) hang cong tan than cao*.