Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh thanh, dong doanh
doanh hoan » doanh khoa, doanh nhan, doanh luan
hieu lang » chieu sang, hieu quang, nhieu tang
cua trong » cua truong, cua trung, qua trong
doi hieu » doi chieu, doc hieu, doi hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tap » toan ban

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