Perhaps you should try some spelling variations:
"literatura espana et islam." » "literatura espanola et islam.", "literatura mexicana et islam.", "literatura enspana et islam.", "literatura delspana et islam.", "literatura espana en islam.", "literatura espana el islam.", "literatura espana e islam.", "literatura espana del islam."
"literatura e et islam." » "literatura en et islam.", "literatura del et islam.", "literatura e el islam.", "literatura e e islam.", "literatura e del islam.", "literatura e en islam.", "literatura y et islam."
"literatura de de islam." » "literatura de del islam.", "literatura de de isla.", "literatura de e islam.", "literatura de fe islam.", "literatura de di islam."

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