Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh thanh, dong doanh
doanh hoan » doanh khoa, doanh nhan, doanh luan
xuong doan » xuong dan, xuong hoan, phuong doan
hieu lang » chieu sang, hieu quang, nhieu tang
doan phan » doanh phan, toan phan, dan phan
doc hieu » toc thieu, hoc thieu, hoc hien
phan cac » nhan cach, phan dau, phan lap

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

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