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