Perhaps you should try some spelling variations:
"la matematica opera ii 3+2" » "la matematica pura ii 3+2", "la matematica per ii 3+2", "la matematica moderna ii 3+2", "a mathematica opera ii 3+2", "e matematica opera ii 3+2", "della matematica opera ii 3+2", "la matematica opera di 3+2", "la matematica opera i 3+2", "la matematica opera im 3+2", "la matematica opera ii a+2", "la matematica opera ii 1+2", "la matematica opera ii 2+2"
"la matematica opera ii _+2" » "la matematica pura ii _+2", "la matematica per ii _+2", "la matematica moderna ii _+2", "a mathematica opera ii _+2", "e matematica opera ii _+2", "della matematica opera ii _+2", "la matematica opera di _+2", "la matematica opera i _+2", "la matematica opera im _+2"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"la matematica opera ii 3+2\") OR (\"la matematica opera ii _+2\"))".
• Removing quotes may allow a broader search: (( la matematica opera ii 3+2 ) OR ( la matematica opera ii _+2 )).
• Adding a wildcard symbol may retrieve word variants: (("la matematica opera ii 3+2") OR ("la matematica opera ii _+2"))*.