Perhaps you should try some spelling variations:
quan thanh » ban thanh, van thanh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh quan » tinh quang, trinh quan, tin quan
hoi hieu » hoi phieu, hoi tieu, moi hieu
van than » van thanh, van thang, van tuan
ban hang » ngan hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh tinh quan thanh cong ((van than) or (ban hang)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh tinh quan thanh cong ((van than) OR (ban hang)) ban.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh tinh quan thanh cong ((van than) or (ban hang)) ban*.