Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
manh dung » manh hung, manh tung, anh dung
dung phan » dung nhan, dung luan, dung ha
phan cong » thanh cong
dung dan » dung san, tung dan, huong dan
dung dat » dung va, dung tai
phan dau » phan tu, hang dau

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

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