Perhaps you should try some spelling variations:
"lecture notes of the di matematica italien" » "lecture notes of the di mathematical vitality", "lecture notes of the de matematica italien", "lecture notes of the e matematica italien", "lecture notes of the la matematica italien"
"lecture notes of the secolo matematica italiana" » "lecture notes of the volo matematica italiana", "lecture notes of the second mathematical italiana", "lecture notes of the della matematica italiana"
"lecture notes of the suono matematica italiana" » "lecture notes of the una matematica italiana", "lecture notes of the vino matematica italiana", "lecture notes of the volo matematica italiana"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lecture notes of the secolo matematica italiana") OR ("lecture notes of the suono matematica italiana"))) OR ("lecture notes of the di matematica italien")).
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• Adding a wildcard symbol may retrieve word variants: (((("lecture notes of the secolo matematica italiana") or ("lecture notes of the suono matematica italiana"))) or ("lecture notes of the di matematica italien"))*.