Perhaps you should try some spelling variations:
"didactica de ricerche" » "didactique de ricerche", "didactic _ ricerche", "didactica e ricerche", "didactica le ricerche", "didactica di ricerche"
"didactica y ricerche" » "didactic _ ricerche", "didactica e ricerche", "didactica le ricerche", "didactica di ricerche"
"didactic a ricerche" » "didactic _ ricerche", "didactic atd ricerche", "didactic kg ricerche", "didactic e ricerche", "didactic le ricerche", "didactic di ricerche"

Try widening your search to All Fields.

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 ricerche") OR ((("didactica y ricerche") OR ("didactica de ricerche")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"didactic a ricerche\") or (((\"didactica y ricerche\") OR (\"didactica de ricerche\"))))".
• Removing quotes may allow a broader search: (( didactic a ricerche ) or ((( didactica y ricerche ) OR ( didactica de ricerche )))).
• Adding a wildcard symbol may retrieve word variants: (("didactic a ricerche") or ((("didactica y ricerche") OR ("didactica de ricerche"))))*.