Perhaps you should try some spelling variations:
"i gran libro de letteratura di" » "i gran libro e letteratura di", "i gran libro di letteratura di", "i gran libro de litteratura di", "i gran libro de letteratura e", "i gran libro de literatura de", "i grand libro de letteratura di", "i grain libro de letteratura di", "i grani libro de letteratura di"
"i grande livre e literatur arti" » "i grande livre e literatur ai", "i grande livre e literatur arne", "i grande livre e literatur martina", "i grand livre e literatur arti", "i grands livres e literatur arti", "i grande liberte e literatur arti", "di grande livre e literatur arti", "i grunde livre e literatur arti", "i grande livre de literatur arti", "i grande livre en literatur arti", "i grande livre et literatur arti", "i grandde livre e literatur arti", "i grainde livre e literatur arti", "i granide livre e literatur arti"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"i gran libro de letteratura di\") OR (\"i grande livre e literatur arti\"))".
• Removing quotes may allow a broader search: (( i gran libro de letteratura di ) OR ( i grande livre e literatur arti )).
• Adding a wildcard symbol may retrieve word variants: (("i gran libro de letteratura di") OR ("i grande livre e literatur arti"))*.