Perhaps you should try some spelling variations:
"literatura arabes y isla." » "literatura arabe y isla.", "literatura arte y isla.", "literature arab y isla.", "literatura arabes e isla."
"literatura el el isaac." » "literatura del el isaac.", "literatura en el isaac.", "literatura de el isaac.", "literatura enl el isaac.", "literatura dell el isaac.", "literatura el en isaac.", "literatura el joel isaac.", "literatura el noel isaac.", "literatura es el isaac."
"literatura e e isaac." » "literatura de e isaac.", "literatura en e isaac.", "literatura del e isaac.", "literatura e de isaac.", "literatura e en isaac.", "literatura e _ isaac.", "literatura el e isaac."

Try widening your search to All Fields.

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