Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
dong huong » dong thuong, dong duong, cong huong
manh tung » manh hung, thanh tung
tung dan » dung dan, huong dan, trung dai
dan dong » van dong, dan dung, dao dong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 (chiet tach)) - manh tung dan dong huong ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - manh tung dan dong huong ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chiet tach)) - manh tung dan dong huong ((dan toan) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chiet tach)) - manh tung dan dong huong ((dan toan) or (dan than)) cau*.