Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
chinh cua » chinh ca, hinh cua, chinh luan
chinh sua » chinh su, chinh luan, hinh su
nho hieu » nha hieu, nho sieu, nhu hieu
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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: nho hieu lang - hanh ((chinh cua) OR (chinh sua)) dung ((cong dan) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho hieu lang - hanh ((chinh cua) OR (chinh sua)) dung ((cong dan) or (cong san)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: nho hieu lang - hanh ((chinh cua) OR (chinh sua)) dung ((cong dan) or (cong san)) toan cau*.