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