Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
manh dung » manh hung, manh tung, anh dung
dung phan » dung nhan, dung luan, dung ha
phan cong » thanh cong
dung toan » dung doanh, dung thang, dung thanh
doc hieu » toc thieu, hoc thieu, hoc hien
dung dan » dung dat, dung san, tung dan
phan lap » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - manh dung phan cong ((dung toan) or (dung dan)) phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - manh dung phan cong ((dung toan) OR (dung dan)) phan lap.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - manh dung phan cong ((dung toan) or (dung dan)) phan lap*.