Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hoang manh » hoang minh, hoang anh, hoang xanh
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
manh cua » doanh cua, ban cua
cua dang » cua cong, cua ban
cong dan » cong san, cong tan, huong dan

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 ((hieu lang) OR (chieu sach)) - hoang manh cua dang cong dan ((van ban) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu sach)) - hoang manh cua dang cong dan ((van ban) or (toan ban))*.