Perhaps you should try some spelling variations:
duong manh » duong van
tieu sach » chieu sach, dien sach, te sach
hanh dung » thanh dung, anh dung, manh dung
hanh dong » anh dong, ha dong
cong manh » cong danh, cong thanh, hoang manh
cua bang » chua bang, cua ban, cua dang
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - ((hanh dung) or (hanh dong)) cua bang ((cong manh) OR (duong manh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh dung) OR (hanh dong)) cua bang ((cong manh) OR (duong manh)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - ((hanh dung) or (hanh dong)) cua bang ((cong manh) OR (duong manh)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - ((hanh dung) or (hanh dong)) cua bang ((cong manh) OR (duong manh)) toan tap*.