Perhaps you should try some spelling variations:
"didactics la ricerca" » "didactics a ricerca", "didactics _ ricerca", "didactic a ricerca"
"didactics di ricerca" » "didactics _ ricerca", "didactics 2 ricerca", "didactics 3 ricerca"
"didactics e ricerca" » "didactics _ ricerca", "didactics 2 ricerca", "didactics 3 ricerca", "didactics 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: (((("didactics e ricerca") OR ("didactics la ricerca"))) OR ("didactics di ricerca")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"didactics e ricerca\") OR (\"didactics la ricerca\"))) or (\"didactics di ricerca\"))".
• Removing quotes may allow a broader search: (((( didactics e ricerca ) OR ( didactics la ricerca ))) or ( didactics di ricerca )).
• Adding a wildcard symbol may retrieve word variants: (((("didactics e ricerca") OR ("didactics la ricerca"))) or ("didactics di ricerca"))*.