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 di ricerca") OR ("didactics la ricerca")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"didactics e ricerca\") or (((\"didactics di ricerca\") OR (\"didactics la ricerca\"))))".
• Removing quotes may allow a broader search: (( didactics e ricerca ) or ((( didactics di ricerca ) OR ( didactics la ricerca )))).
• Adding a wildcard symbol may retrieve word variants: (("didactics e ricerca") or ((("didactics di ricerca") OR ("didactics la ricerca"))))*.