Perhaps you should try some spelling variations:
strumenti per » strumento per
la didactics » a didactics, _ didactics, a didactic
la didactica » la didattica, a didactic, a didactical
e la » a la, e a

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