Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh huong » thanh huong, anh huong, manh huong
doi chieu » doc hieu, doi chi, ho chieu
huong cua » dung cua
dong cong » duong cong, dung cong, dang cong
cua dong » chua dong, cua cong, cua dang
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh huong cua dong cong ((xuan toan) or (((dan than) or (van than)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh huong cua dong cong ((xuan toan) OR (((dan than) OR (van than)))) cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh huong cua dong cong ((xuan toan) or (((dan than) or (van than)))) cau*.