Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
doanh doanh » toan doanh, doanh hoan, doanh thanh
hieu quang » hieu quan, hieu qua, diep quang
nhung cong » dung cong, thong cong, hang cong
doanh cua » doanh luan
cua nhung » va nhung
cong dan » cong san, cong tan, huong dan
toan ban » van ban

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: hoi ((hieu quang) OR (thieu quang)) - doanh doanh cua nhung cong dan ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu quang) OR (thieu quang)) - doanh doanh cua nhung cong dan ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu quang) OR (thieu quang)) - doanh doanh cua nhung cong dan ((toan tap) or (toan ban))*.