Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
trong chua » trong chuan, trong chu, trong cua
chua dong » cua dong, ha dong, huy dong
dong dung » dong duong, duong dung, cong dung
dan toan » van toan, manh toan, xuan toan
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 ((chieu xanh) OR (chieu sach)) - thanh trong chua dong dung ((dan toan) OR (dan than)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) OR (chieu sach)) - thanh trong chua dong dung ((dan toan) or (dan than)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) OR (chieu sach)) - thanh trong chua dong dung ((dan toan) or (dan than)) ban*.