Perhaps you should try some spelling variations:
chinh doanh » kinh doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
khong cong » thong cong, khong cang, chong cong
hieu lang » hieu quang, nhieu tang, hieu van
doanh cua » doanh luan
cua khong » hua khong, cua phuong, cua thuong
cong san » cong tac
pham tap » pha tap, phan tap, pham tan
pham tai » pham thi, pham van

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: thien ((hieu lang) OR (chieu sang)) - chinh doanh cua khong cong san ((pham tap) OR (pham tai))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thien ((hieu lang) OR (chieu sang)) - chinh doanh cua khong cong san ((pham tap) or (pham tai))~".
• Adding a wildcard symbol may retrieve word variants: thien ((hieu lang) OR (chieu sang)) - chinh doanh cua khong cong san ((pham tap) or (pham tai))*.