Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
cua thuong » cua truong, cua phuong, ca thuong
cua khong » hua khong, cua phuong, cua cong
chi xanh » chi anh, chi danh, chi hanh
cong dan » cong san, cong tan, huong dan
than ban » thanh ban, than man, nhuan ban
toan ban » van ban
doi chi » doi khi

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 - doanh doanh ((cua khong) OR (cua thuong)) cong dan ((than ban) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - doanh doanh ((cua khong) OR (cua thuong)) cong dan ((than ban) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - doanh doanh ((cua khong) OR (cua thuong)) cong dan ((than ban) or (toan ban))*.