Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
quang cua » quan cua, quang tuan, quang huy
dong cong » duong cong, dung cong, dang cong
cua dong » chua dong, cua cong, cua dang
cong tac » cong ty
toan cao » toan tap
toan ban » van ban

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 - nhanh quang cua dong cong tac ((toan cao) OR (toan ban))~.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - nhanh quang cua dong cong tac ((toan cao) or (toan ban))*.