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

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