Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh dung » thanh dung, anh dung, hanh dong
dang cong » dung cong
dung cua » dung luan, dung cho
cua dang » cua cong, cua ban
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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 ((hieu manh) OR (chiet tach)) - hanh dung cua dang cong ((tan toan) OR (tap toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chiet tach)) - hanh dung cua dang cong ((tan toan) or (tap toan)) cau*.