Perhaps you should try some spelling variations:
institution der » institutionen der, konstitution der, institutionen des
instituto de » institut der
istituto del » instituto del, istituto degli, istituto delle
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 (institution der))))) OR (((istituto del) OR (instituti di)))) historia argentina%22.
• Adding a wildcard symbol may retrieve word variants: %contributo della%((((istituto di) or (((instituto de) or (institution der))))) or (((istituto del) or (instituti di)))) historia argentina%22*.