Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
cap duong » cau duong, cac duong, cap dung
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan
ap dung » xay dung, van 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: hoc thieu xanh - thanh tung ((cap duong) OR (ap dung)) cong ((san toan) OR (dan toan)) ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung ((cap duong) or (ap dung)) cong ((san toan) or (dan toan)) ban*.