Perhaps you should try some spelling variations:
"lecture notes of the unione matematica della" » "lecture notes of the funcoes matematica della", "lecture notes of the suono matematica della", "lecture notes of the una matematica della", "lecture notes of the unione matematica nella", "lecture notes of the unione matematiche dalla", "lecture notes of the unione matematica da"
"lecture notes of the una matematici della" » "lecture notes of the una matematici per", "lecture notes of the una matematica da", "lecture notes of the una matematica della", "lecture notes of the un matematico della", "lecture notes of the la matematica della"
"lecture notes of the rudi matematici della" » "lecture notes of the rudi matematici per", "lecture notes of the rudi matematica da", "lecture notes of the di matematici della", "lecture notes of the di matematica della", "lecture notes of the i matematici della"

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