Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tung » thanh cong
hoc chieu » hoc thieu, ho chieu, hoc hien
va phuong » va thuong, cac phuong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 - thanh tung ((va phuong) OR (he thong)) cong dan toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - thanh tung ((va phuong) or (he thong)) cong dan toan cao*.