Perhaps you should try some spelling variations:
"literatura espana de islam." » "literatura espanola de islam.", "literatura mexicana de islam.", "literatura despana de islam.", "literatura enspana de islam.", "literatura delspana de islam.", "literatura espana del islam.", "literatura espana de isla.", "literatura espana e islam."
"literatura enl _ isaac." » "literatura en _ isaac.", "literatura el _ isaac.", "literatura del _ isaac.", "literatura denl _ isaac.", "literatura ennl _ isaac.", "literatura delnl _ isaac."
"literatura e el islam." » "literatura de el islam.", "literatura en el islam.", "literatura del el islam.", "literatura es el islam."

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