Perhaps you should try some spelling variations:
historia antiga » historia antigua, historia antiqua
instituto de » institut der, institution der
instituti di » istituti di, instituti _, instituti a
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 (instituti di)) ((historia antiga) OR (historia argentina))%22.
• Adding a wildcard symbol may retrieve word variants: %contributo della%((((istituto di) or (instituto de))) or (instituti di)) ((historia antiga) or (historia argentina))%22*.