Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tung » thanh cong
tieu xanh » tieu danh, dieu hanh, tien anh
trong san » trong cac, cong san, dong san
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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 ((tieu xanh) OR (chieu xanh)) - ((thanh trung) OR (thanh tung)) va dung trong san toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu xanh) OR (chieu xanh)) - ((thanh trung) or (thanh tung)) va dung trong san toan cao~".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu xanh) OR (chieu xanh)) - ((thanh trung) or (thanh tung)) va dung trong san toan cao*.