Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
hanh ban » thanh ban, hang ban, hanh san
vat dung » van dung, va dung, viet dung
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
chan ban » can ban, chat ban, chan nan
ban vat » bang vat, ben vat, ban va

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)) - hanh ban vat dung ((cong san) or (cong tan)) chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - hanh ban vat dung ((cong san) OR (cong tan)) chan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - hanh ban vat dung ((cong san) or (cong tan)) chan ban*.