Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dung luong » dung thuong, dung phuong, dung truong
luong cong » dung cong, trong cong, tong cong
hanh dung » thanh dung, anh dung, hanh dong
cong cong » cong dong, trong cong, dung cong
chu sach » cau sach, thu sach, chuc hach
san toan » dan toan, manh toan, xuan toan
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 ((chu sach) OR (chieu sach)) - hanh dung luong cong cong ((san toan) OR (van toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sach) OR (chieu sach)) - hanh dung luong cong cong ((san toan) or (van toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sach) OR (chieu sach)) - hanh dung luong cong cong ((san toan) or (van toan)) cao*.