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

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