Perhaps you should try some spelling variations:
historia politica » historical political, history politics
contributo allo » contributo alla, contribute all, contributors alloy
contributi alla » contributi dalla, contributo alla, contribute all
storia gotica » storia antica, storia politica, storia critica
instituti di » instituti _, instituti a, institution die
istituto di » instituto de, instituto ad
istituti di » istituti pii, istituiti sic, istituto del

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 allo) OR (contributi alla))%((istituto di) OR (((istituti di) OR (instituti di)))) ((storia gotica) OR (historia politica))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((contributo allo) OR (contributi alla))%((istituto di) or (((istituti di) or (instituti di)))) ((storia gotica) or (historia politica))%22".
• Adding a wildcard symbol may retrieve word variants: %((contributo allo) OR (contributi alla))%((istituto di) or (((istituti di) or (instituti di)))) ((storia gotica) or (historia politica))%22*.