Perhaps you should try some spelling variations:
"un gran libro x letterature storie" » "un gran libro x letteratura storia", "un gran libro x litterature serbe", "un gran libro x letterature straniere", "un gran libro e letterature storie", "un gran libro le letterature storie", "un gran libro e letteratura storie", "un grand libro x letterature storie", "un gran libros x letterature storie", "un gran libro i letterature storie", "un gran libro _ letterature storie"
"2 amanda e e literatur di" » "2 amanda e e literatur die", "2 amanda e e literatur din", "2 amanda e e literatur d", "_ amanda e e literatur di", "1 amanda e e literatur di", "6 amanda e e literatur di", "2 amanda l e literatur di", "2 amanda j e literatur di", "2 amanda m e literatur di"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("un gran libro x letterature storie") OR ("2 amanda e e literatur di")).
• Removing quotes may allow a broader search: (( un gran libro x letterature storie ) or ( 2 amanda e e literatur di )).
• Adding a wildcard symbol may retrieve word variants: (("un gran libro x letterature storie") or ("2 amanda e e literatur di"))*.