Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
manh tran » manh toan, manh tuan, canh tranh
tran tuan » tran xuan, tran quang, tran thanh
tuan phan » luan phan, toan phan, tuan pham
phan cong » thanh cong
san toan » dan toan, 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: theo ((hieu manh) OR (hieu lang)) - manh tran tuan phan cong ((san toan) OR (van toan)) cao~.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (hieu lang)) - manh tran tuan phan cong ((san toan) or (van toan)) cao*.