Perhaps you should try some spelling variations:
cong nguong » cong nguon, cong thuong, cong luong
hieu quang » thieu quang, hieu quan, hieu qua
chinh cua » chinh ca, chinh sua, hinh cua
hoi hieu » hoi phieu, hoi tieu, moi hieu
dan toan » dan than, 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: hoi hieu quang - hanh chinh cua cong nguong ((dan toan) OR (van toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoi hieu quang - hanh chinh cua cong nguong ((dan toan) or (van toan)) cau*.