Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
canh trang » canh tranh, hanh trang, banh trang
dung thanh » duong thanh, dong thanh, dang thanh
dung cong » dung trong
dung toan » dung doanh, dung thang, dung tai
trang va » tran van, hang 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 tinh)) - canh trang va dung cong ((dung toan) OR (dung thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu tinh)) - canh trang va dung cong ((dung toan) OR (dung thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chieu tinh)) - canh trang va dung cong ((dung toan) OR (dung thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu tinh)) - canh trang va dung cong ((dung toan) OR (dung thanh)) cau*.