Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
hanh nang » ganh nang, hanh mang, hanh trang
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
anh nang » ganh nang, anh bang, anh dang
bai toan » bai tap
toan tap » toan 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 - ((hanh nang) OR (anh nang)) cua ((hang cong) OR (hang nong)) bai toan tap~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((hanh nang) or (anh nang)) cua ((hang cong) or (hang nong)) bai toan tap*.