Perhaps you should try some spelling variations:
la matematica » a mathematica, e matematica, della matematica
opera ii » opera di, opera im, opera ix
pura ii » aura ii, pleura ii, petra ii
opera i » opera di, opera im, opera ix

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: la matematica ((pura ii) OR (((opera ii) OR (opera i)))) 3+2.
• The words AND, OR and NOT may confuse the search; try adding quotes: "la matematica ((pura ii) or (((opera ii) OR (opera i)))) 3+2".
• Adding a wildcard symbol may retrieve word variants: la matematica ((pura ii) or (((opera ii) OR (opera i)))) 3+2*.