Perhaps you should try some spelling variations:
"literature arabes de isaac." » "literatura arabe de isaac.", "literature arab de isaac.", "literature francesc de isaac.", "literature arabes e isaac.", "literature arabe de isaac.", "literature arabes y isaac.", "literature arabes den isaac.", "literature arabes d_ isaac.", "literature arabes dc isaac."
"literatura en de ilam." » "literatura espana de ilam.", "literatura en de islam.", "literatura en de chilam."
"literatura de e isaac." » "literatura de en isaac.", "literatura de _ isaac.", "literatura de c isaac.", "literatura de el isaac.", "literatura de fe isaac."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("literatura de e isaac.") or ("literatura en de ilam."))) or ("literature arabes de isaac."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura de e isaac.") OR ("literatura en de ilam."))) OR ("literature arabes de isaac.")).
• Removing quotes may allow a broader search: (((( literatura de e isaac. ) or ( literatura en de ilam. ))) or ( literature arabes de isaac. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura de e isaac.") or ("literatura en de ilam."))) or ("literature arabes de isaac."))*.