Perhaps you should try some spelling variations:
"didatica do ricerca" » "didactica de ricerca", "didatica com ricerca", "dinamica do ricerca", "didatica di ricerca", "didatica r.o ricerca", "didatica la ricerca"
"didattica e ricerche" » "didattica e ricerca", "didactic e ricerche", "didactics e ricerche"

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