Perhaps you should try some spelling variations:
dong trong » duong trong, dung trong, cong trong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh dung » thanh dung, anh dung, hanh dong
luan dong » luan cong, quan dong, luan nong
van toan » van tuan, van thanh, manh toan
van tan » van tuan, van ban, van tai

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 (chieu sang)) - hanh dung luan dong trong ((van toan) OR (van tan)) cao~.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (chieu sang)) - hanh dung luan dong trong ((van toan) or (van tan)) cao*.