Perhaps you should try some spelling variations:
"literature arabes e isla." » "literatura arabe e isla.", "literature arab e isla.", "literature francesc e isla.", "literature arabes e islas.", "literature arabes de isla.", "literature arabes e islam."
"literatura en de islam." » "literatura espana de islam.", "literatura en del islam.", "literatura en de isla.", "literatura en e islam.", "literatura en de islasm.", "literatura en dde islam.", "literatura en de islamm."
"literatura de en isaac." » "literatura de e isaac.", "literatura de de isaac.", "literatura de _ isaac.", "literatura de un isaac.", "literatura de el isaac.", "literatura fe en isaac."

Try widening your search to All Fields.

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