Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
tang luan » dung luan
mang cua » manh cua, dung cua, ban cua
nam toan » nam tan, nam thanh, nam thang
tam toan » tap toan, tam than, pham toan

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 ((tang luan) or (mang cua)) nhung cong ((nam toan) or (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh ((tang luan) OR (mang cua)) nhung cong ((nam toan) OR (tam toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh ((tang luan) or (mang cua)) nhung cong ((nam toan) or (tam toan)) cau*.