Perhaps you should try some spelling variations:
manh tuong » manh tung, manh cuong, minh tuong
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
manh toan » thanh toan, anh tuan, tinh toan
tuong va » truong va, thuong va, luong va
va thong » va thuong, va phuong, he thong
dan than » dan chan, ban than, van than

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - manh tuong va thong cong ((dan than) OR (manh toan)) ban~.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - manh tuong va thong cong ((dan than) or (manh toan)) ban*.