Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
trung vap » trung va, trung van, trung lap
trung cap » truong cao, trung tam
trong bai » trong ban, thong bai, trong hai
bai toan » bai tap
toan ban » van ban

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 - thanh ((trung vap) or (trung cap)) dung trong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((trung vap) OR (trung cap)) dung trong bai toan ban*.