Perhaps you should try some spelling variations:
"i grand livre et letteratura sulla" » "i grand livre et letteratura russa", "i grand livre et letteratura del", "i grand livre e letteratura sulla", "i grand livre et litterature sulla", "i grand livre di letteratura sulla", "i grand livres et letteratura sulla", "i grand livre en letteratura sulla", "i grand livre des letteratura sulla", "i grunde livre et letteratura sulla"
"i gram libro la literatura y" » "i gram libro la litterature y", "i gram libro a literature y", "i gran libro la literatura y", "i gram libro de literatura y", "i gram libro di literatura y", "i gram libro i literatura y", "bi gram libro la literatura y"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("i gram libro la literatura y") OR ("i grand livre et letteratura sulla")).
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• Adding a wildcard symbol may retrieve word variants: (("i gram libro la literatura y") or ("i grand livre et letteratura sulla"))*.