Perhaps you should try some spelling variations:
"literatura arabe un islam." » "literatura breve un islam.", "literatura de un islam.", "literatura al un islam.", "literatura arabes un islam.", "literatura arabe en islam.", "literatura arabes en islam.", "literatura arabe el islam.", "literatura arabe e islam.", "literatura arabe al islam."
"literatura del den islam." » "literatura de den islam.", "literatura en den islam.", "literatura del del islam.", "literatura del de islam.", "literatura del el islam.", "literatura del eden islam.", "literatura del dean islam."
"literatura e e isla." » "literatura de e isla.", "literatura en e isla.", "literatura e e islas.", "literatura e de isla.", "literatura e e islam.", "literatura el e isla."

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