Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
dung cong » dung trong
hanh ban » thanh ban, hang ban, hanh san
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan ban » can ban, chat ban, chan nan
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)) - hanh ban va dung 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 va dung cong tan chan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - hanh ban va dung cong tan chan ban*.