Perhaps you should try some spelling variations:
istituiti sic » istituti di, istituti pii
storia gotica » storia antica, storia politica, storia critica
instituto de » institut der, institution der
istituto di » instituto ad
%contributo » %contributor, %contribute, %contributi

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