Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh hoan » trinh han, trinh hoa, trinh toan
hoan nhung » hoa nhung, hon nhung, doanh nhung
nhung cong » dung cong, thong cong, hang cong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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 chinh sach - canh trinh hoan nhung cong ((dan than) OR (dan chan)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - canh trinh hoan nhung cong ((dan than) or (dan chan)) cau*.