Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, thanh tinh, canh tinh
ban thanh » ban hanh
van than » van thanh, van thang, van tuan
ban hang » ngan hang
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 tinh) OR (nhanh tinh)) ban thanh cong ((van than) OR (ban hang)) ban~.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((hanh tinh) or (nhanh tinh)) ban thanh cong ((van than) or (ban hang)) ban*.