Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
nhanh mang » nhanh lang, hanh mang, nhanh quang
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
chat ban » nhat ban, chat ran, cua ban
mang va » mang vua, hang va, bang va
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chieu sang)) - nhanh mang va dung ((cong dan) or (cong tac)) chat ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - nhanh mang va dung ((cong dan) OR (cong tac)) chat ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - nhanh mang va dung ((cong dan) or (cong tac)) chat ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - nhanh mang va dung ((cong dan) or (cong tac)) chat ban*.