Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
canh doanh » hanh doanh, chinh doanh, kinh doanh
thong cong » tong cong, thong thong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
doan phan » doanh phan, toan phan, dan phan
phan cac » nhan cach, phan dau, phan lap
ho hieu » ho chieu, hoi hieu, nho hieu

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

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