Perhaps you should try some spelling variations:
storia politica » historia politica, teoria politica, historico politica
storia critica » historia critica, teoria critica, stories critical
storia gotica » storia antica, storia emotiva, storia greca
istituto di » instituto de, instituto ad
istituti di » instituti di, istituti pii, istituiti sic
%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 (istituti di)) ((((storia gotica) OR (storia critica))) OR (storia politica))%22.
• Adding a wildcard symbol may retrieve word variants: %contributo della%((istituto di) or (istituti di)) ((((storia gotica) or (storia critica))) or (storia politica))%22*.