Perhaps you should try some spelling variations:
contributi dalla » contributi alla, contributo alla, contributi di
storia gotica » storia antica, storia politica, storia critica
instituto de » institut der, institution der
istituti di » instituti di, istituto di, istituti pii

Try widening your search to All Fields.

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: %((contributi dalla) OR (contributo della))%((instituto de) OR (istituti di)) storia gotica%22.
• Adding a wildcard symbol may retrieve word variants: %((contributi dalla) or (contributo della))%((instituto de) or (istituti di)) storia gotica%22*.