Perhaps you should try some spelling variations:
dong doanh » dung doanh, trong doanh, doanh doanh
hieu sang » chieu sang, hieu lang, hieu quang
tranh cua » doanh cua, manh cua
doc hieu » toc thieu, hoc thieu, hoc hien
cua bang » chua bang, cua ban, cua dang
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu

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: doc hieu sang - canh tranh cua bang ((dong doanh) OR (cong dan)) phan cau~.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - canh tranh cua bang ((dong doanh) or (cong dan)) phan cau*.