Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
truong lam » trong lam, truong ham, truong luan
hoc thieu » toc thieu, hoc hien
trung lap » trung cap, truong lop, trung tam
trong van » trong cac
van toan » van tuan, van tan, van thanh
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 thieu xanh - thanh ((trung lap) OR (truong lam)) dung trong van toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((trung lap) or (truong lam)) dung trong van toan cao*.