Perhaps you should try some spelling variations:
"didactica de ricerca" » "didactique de ricerca", "didactic _ ricerca", "didactica di ricerca", "didactica e ricerca", "didactica de recerca"
"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 ("didactica de ricerca")).
• Removing quotes may allow a broader search: (( didattica e ricerche ) or ( didactica de ricerca )).
• Adding a wildcard symbol may retrieve word variants: (("didattica e ricerche") or ("didactica de ricerca"))*.