Perhaps you should try some spelling variations:
"el gran libro x letterature storie" » "el gran libro x letteratura storia", "el gran libro x litterature serbe", "el gran libro x letterature straniere", "el gran libro e letterature storie", "el gran libro le letterature storie", "el gran libro _ litterature storie", "el gran libros x letterature storie", "el gran libro i letterature storie", "el gran libro _ letterature storie", "el grand libro x letterature storie", "el grant libro x letterature storie", "el gray libro x letterature storie"
"1 amanda j e letteratura e" » "1 amanda j y literatura e", "1 amanda j e literatur e", "17 amanda j e letteratura e", "_ amanda j e letteratura e", "2 amanda j e letteratura e", "1 amanda l e letteratura e", "1 amanda m e letteratura e"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("el gran libro x letterature storie") OR ("1 amanda j e letteratura e")).
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