Perhaps you should try some spelling variations:
"literatura espana del islam." » "literatura espanola del islam.", "literatura mexicana del islam.", "literatura despana del islam.", "literatura enspana del islam.", "literatura delspana del islam.", "literatura espana de islam.", "literatura espana el islam."
"literatura el de isaias." » "literatura del de isaias.", "literatura en de isaias.", "literatura de de isaias.", "literatura enl de isaias.", "literatura dell de isaias.", "literatura el de indias.", "literatura el de isaac."
"literatura e e islam." » "literatura de e islam.", "literatura en e islam.", "literatura del e islam.", "literatura e el islam.", "literatura e e islas.", "literatura e de islam.", "literatura el e islam."

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