Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
manh tuong » manh tung, manh cuong, minh tuong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tuong cu » tuong cua, tuong tu, tuong c
tam toan » tap toan, pham toan, tam thanh
tam than » ban than
cu dung » su dung, cau duong, duc dung

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 - manh tuong cu dung cong ((tam toan) or (tam than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - manh tuong cu dung cong ((tam toan) OR (tam than)) cau*.