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
cong cong » cong dong, trong cong, dung cong
doi hieu » doi chieu, doc hieu, doi hien
cong tan » cong tac, cong san, cong thanh
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - ((doanh hoan) OR (doanh doanh)) cua cong cong tan ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - ((doanh hoan) OR (doanh doanh)) cua cong cong tan ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - ((doanh hoan) OR (doanh doanh)) cua cong cong tan ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - ((doanh hoan) OR (doanh doanh)) cua cong cong tan ((toan tai) or (toan ban))*.