Perhaps you should try some spelling variations:
"literatura arabe et islam." » "literatura breve et islam.", "literatura de et islam.", "literatura al et islam.", "literatura arabe en islam.", "literatura arabe e islam.", "literatura arabe el islam.", "literatura arabe del islam.", "literatura arabe e islas."
"literatura e el islam." » "literatura de el islam.", "literatura en el islam.", "literatura del el islam.", "literatura es el islam."
"literatura y un islam." » "literatura y e islam.", "literatura y al islam.", "literatura y _ islam.", "literatura y en islam.", "literatura a un islam."

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