Perhaps you should try some spelling variations:
hanh doanh » hang doanh, chinh doanh, doanh doanh
thanh toan » thanh hoa, thanh san
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua khong, cua tong
hua khong » hoa khong, cua khong, hoac khong
doi hieu » doi chieu, doc hieu, doi hien

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: doi hieu lang - hanh doanh ((cua thong) OR (hua khong)) cong ((thanh toan) OR (tinh toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - hanh doanh ((cua thong) or (hua khong)) cong ((thanh toan) OR (tinh toan)) tap~".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - hanh doanh ((cua thong) or (hua khong)) cong ((thanh toan) OR (tinh toan)) tap*.