Perhaps you should try some spelling variations:
strumenti per » strumento per
la didactica » la didattica, a didactic, a didactical
didactica e » didactica de, didattica e, didactica y
una ricerca » la ricerca, alla ricerca
a ricerca » la ricerca, e ricerca, tra ricerca

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: strumenti per la didactica e ((a ricerca) OR (una ricerca)).
• Adding a wildcard symbol may retrieve word variants: strumenti per la didactica e ((a ricerca) or (una ricerca))*.