Perhaps you should try some spelling variations:
"lecture notes of the unione matematica italien" » "lecture notes of the unione matematica italiana", "lecture notes of the unione mathematical vitality", "lecture notes of the suono matematica italien", "lecture notes of the urbino matematica italien", "lecture notes of the vino matematica italien"
"lecture notes of the funcoes matematica italien" » "lecture notes of the funcoes matematica italiana", "lecture notes of the funcoes mathematical vitality", "lecture notes of the functions mathematical italien", "lecture notes of the functions mathematics italien"
"lecture notes of the una matematica italien" » "lecture notes of the una matematica italiana", "lecture notes of the una mathematical vitality", "lecture notes of the la matematica italien", "lecture notes of the tra matematica italien", "lecture notes of the a matematica italien"

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