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 al islam.", "literatura arabe _ 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 islam." » "literatura de e islam.", "literatura en e islam.", "literatura e el islam.", "literatura e e islas.", "literatura e del islam.", "literatura e de islam.", "literatura el e islam."

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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 islam."))~.
• 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 islam.")).
• Removing quotes may allow a broader search: (((( literatura arabe un islam. ) or ( literatura del den islam. ))) or ( literatura e e islam. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura arabe un islam.") or ("literatura del den islam."))) or ("literatura e e islam."))*.