Perhaps you should try some spelling variations:
strumenti per » strumento per
la didactics » a didactics, _ didactics, 4 didactics
la didactica » a didactical, alla didattica, _ didactics
a didactic » _ didactics
a ricerca » la ricerca, e ricerca, una 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 didactics) OR (la didattica))) OR (((la didactica) OR (a didactic)))) e a ricerca.
• The words AND, OR and NOT may confuse the search; try adding quotes: "strumenti per ((((la didactics) OR (la didattica))) or (((la didactica) or (a didactic)))) e a ricerca".
• Adding a wildcard symbol may retrieve word variants: strumenti per ((((la didactics) OR (la didattica))) or (((la didactica) or (a didactic)))) e a ricerca*.