Perhaps you should try some spelling variations:
"lecture notes of the internationale matematico alla" » "lecture notes of the internazionale matematico alla", "lecture notes of the international mathematics alla", "lecture notes of the international mathematical alla", "lecture notes of the internationale matematica alla", "lecture notes of the internationale matematico nella", "lecture notes of the internationale matematiche dalla"
"lecture notes of the unione matematico alla" » "lecture notes of the unione matematica alla", "lecture notes of the nazionale matematico alla", "lecture notes of the unione matematico nella", "lecture notes of the unione matematiche dalla"
"lecture notes of the un matematico alla" » "lecture notes of the un matematica alla", "lecture notes of the un matematico nella", "lecture notes of the un matematiche dalla", "lecture notes of the una matematica alla", "lecture notes of the e matematico alla", "lecture notes of the de matematicos alla"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lecture notes of the unione matematico alla") OR ("lecture notes of the un matematico alla"))) OR ("lecture notes of the internationale matematico alla")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"lecture notes of the unione matematico alla\") OR (\"lecture notes of the un matematico alla\"))) or (\"lecture notes of the internationale matematico alla\"))".
• Removing quotes may allow a broader search: (((( lecture notes of the unione matematico alla ) OR ( lecture notes of the un matematico alla ))) or ( lecture notes of the internationale matematico alla )).
• Adding a wildcard symbol may retrieve word variants: (((("lecture notes of the unione matematico alla") OR ("lecture notes of the un matematico alla"))) or ("lecture notes of the internationale matematico alla"))*.