Perhaps you should try some spelling variations:
historia antigua » historia antiqua
historia antiga » historia antiqua, historia argentina
institution der » institutionen der, konstitution der, institutionen des
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 (institution der))) OR (istituti di)) ((historia antiga) OR (historia antigua))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%contributo della%((((istituto di) or (institution der))) or (istituti di)) ((historia antiga) OR (historia antigua))%22".
• Adding a wildcard symbol may retrieve word variants: %contributo della%((((istituto di) or (institution der))) or (istituti di)) ((historia antiga) OR (historia antigua))%22*.