Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
hanh bang » anh bang, hanh mang, lanh bang
dung cong » dung trong
ban thanh » ban hanh, ban hang
bang vat » bang va, dang vat, cang vat
vat dung » van dung, va dung, viet dung
van toan » van tuan, van tan, van thanh

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 - hanh bang vat dung cong ((van toan) OR (ban thanh)) cau~.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh bang vat dung cong ((van toan) or (ban thanh)) cau*.