Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
luan trong » luat trong, luan tuong, luong trong
quan trong » gian trong
hoc thieu » toc thieu, hoc hien
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
chan cao » chan cho, chat cao, chay cao

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 - canh tranh ((luan trong) OR (quan trong)) cong tac chan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh tranh ((luan trong) or (quan trong)) cong tac chan cao*.