Perhaps you should try some spelling variations:
didattica di » didattica del, didactica de, didatica do
"Didattica di ricerca" » "Didattica la ricerca"
"Didattica e ricerca" » "Didattica la ricerca"

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