Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
luan trong » luat trong, luan tuong, luong trong
quan trong » gian trong
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 ((chieu xanh) OR (chieu sach)) - canh tranh ((luan trong) OR (quan trong)) cong tac chan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sach)) - canh tranh ((luan trong) or (quan trong)) cong tac chan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sach)) - canh tranh ((luan trong) or (quan trong)) cong tac chan cao*.