Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trung dap » trung cap, trung dam, trung lap
trung dai » truong dai, truong dao, trung tam
trong san » trong cac, cong san, dong san
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - hanh ((trung dap) or (trung dai)) dung trong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((trung dap) OR (trung dai)) dung trong san toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((trung dap) or (trung dai)) dung trong san toan cao*.