Perhaps you should try some spelling variations:
"i grainde livre e letteratura arti" » "i grainde livre e letteratura arte", "i grainde livre e letteratura sarda", "i grainde livre e letteratura di", "i grande livre e letteratura arti", "i grand livre e letteratura arti", "i grain vivre e letteratura arti", "i grainde livre y literatura arti", "i grainde livre e literatur arti", "i grunde livre e letteratura arti", "i grain livre e letteratura arti", "i grainde livre de letteratura arti", "i grainde livre en letteratura arti", "i grainde livre et letteratura arti"
"i gran libro de literatura de" » "i gran libro de litterature de", "i gran libro la literatura de", "i gran libro y literatura de", "i gran libro de literatura y", "i gran libro de literatura en", "i grand libro de literatura de", "i grain libro de literatura de", "i grani libro de literatura de"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("i gran libro de literatura de") OR ("i grainde livre e letteratura arti")).
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