Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hanh dung » thanh dung, anh dung, hanh dong
cong cong » cong dong, dung cong, dang cong
manh toan » thanh toan, anh tuan, tinh toan
dung cua » dung luan, dung cho
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: hoc thieu xanh - hanh dung cua ((cong cong) OR (trong cong)) ((manh toan) OR (dan than)) cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh dung cua ((cong cong) or (trong cong)) ((manh toan) or (dan than)) cao*.