Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
chi sach » chinh sach, chieu sach, co sach
van toan » van tuan, van tan, van thanh
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat
doi chi » doi khi

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: doi chi sach - hanh trung cua nhung cong ((van toan) OR (((dan than) OR (dan chan)))) cau~.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - hanh trung cua nhung cong ((van toan) or (((dan than) or (dan chan)))) cau*.