Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
canh manh » lanh manh, canh tranh, cach mang
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
dan toan » van toan, xuan toan, dien toan
dan than » dan chan, ban than, van than

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: doc hieu nganh - canh manh cua dung trong ((((dan toan) OR (manh toan))) OR (dan than)) cao~.
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - canh manh cua dung trong ((((dan toan) or (manh toan))) or (dan than)) cao*.