Perhaps you should try some spelling variations:
sfide matematica » sfide matematiche, de matematica, series matematica
matematica della » matematici della, matematica nella, matematiche dalla
i matematica » di matematica, i mathematica, e matematica

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: (( lecture notes of the sfide matematica della ) OR ( lecture notes of the i matematica e )).
• Adding a wildcard symbol may retrieve word variants: (( lecture notes of the sfide matematica della ) or ( lecture notes of the i matematica e ))*.