Perhaps you should try some spelling variations:
dien sach » dien anh
doc dien » duoc dien, doi dien, do dien
anh dong » anh huong, anh son
dong cua » dung cua, cong cua, huong cua
cua dang » cua cong, cua ban
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
thai cac » thoai cac, tai cac, khai cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc dien sach - anh dong cua dang ((cong dan) or (cong san)) thai cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc dien sach - anh dong cua dang ((cong dan) OR (cong san)) thai cac.
• Adding a wildcard symbol may retrieve word variants: doc dien sach - anh dong cua dang ((cong dan) or (cong san)) thai cac*.