Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
dung cong » dung trong
van thanh » ban thanh, van tuan
chinh ta » chinh tai, chinh va, chinh tri
dan toan » van toan, dan than, manh toan
ta dung » tac dung, tan dung, tao dung

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: hoc chiet tach - hanh chinh ta dung cong ((dan toan) OR (van thanh)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh chinh ta dung cong ((dan toan) or (van thanh)) cao*.