Perhaps you should try some spelling variations:
didactica de » didactique de, didactic _
didactic a » didactic _, didactic atd, didactica y
de ricerca » di ricerca, e ricerca, de recerca
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: (( didactic a ricerca ) OR ( didactica de ricerca )).
• Adding a wildcard symbol may retrieve word variants: (( didactic a ricerca ) or ( didactica de ricerca ))*.