Perhaps you should try some spelling variations:
doanh quan » doanh quang, doanh luan, doan quan
doanh qua » doanh cua, danh qua, doanh quang
dung cong » dung trong
chi xanh » chi anh, chi danh, chi hanh
cong dan » cong san, cong tan, huong dan
thai cao » thoai cac, thuat cao, toan cao
doi chi » doi khi
tai cao » tao cao, tai sao, tai cac

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 chi xanh - hanh ((doanh qua) OR (doanh quan)) dung cong dan ((thai cao) OR (tai cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - hanh ((doanh qua) or (doanh quan)) dung cong dan ((thai cao) OR (tai cao))~".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - hanh ((doanh qua) or (doanh quan)) dung cong dan ((thai cao) OR (tai cao))*.