Perhaps you should try some spelling variations:
didattica la » didattica della, didattica nella, disprattica la
didattica le » didattica del, didattica nel, didactica de
"didattica e ricerca" » "didattica la ricerca", "didattica di ricerca", "didattica e ricerche"

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: (("didattica e ricerca") OR ("((didattica la) OR (didattica le)) ricerca")).
• Removing quotes may allow a broader search: (( didattica e ricerca ) or ( ((didattica la) OR (didattica le)) ricerca )).
• Adding a wildcard symbol may retrieve word variants: (("didattica e ricerca") or ("((didattica la) OR (didattica le)) ricerca"))*.