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
dan chan » dan gian, dan ca
van chat » cao chat
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 ((dan chan) OR (van chat)) 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 ((dan chan) OR (van chat)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu sang)) - hanh ban va dung cong ((dan chan) OR (van chat)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - hanh ban va dung cong ((dan chan) OR (van chat)) ban*.