Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
cang thang » cong thanh, dang thanh
hoc thieu » toc thieu, hoc hien
va duong » van duong, va tuong, va huong
vat dung » van dung, va dung, viet dung
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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 - cang thang ((va duong) OR (vat dung)) cong tap toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - cang thang ((va duong) or (vat dung)) cong tap toan ban*.