Perhaps you should try some spelling variations:
"literatura arabe un islam." » "literatura breve un islam.", "literatura de un islam.", "literatura e 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 _ en islam." » "literatura _ el islam.", "literatura _ e islam.", "literatura _ en ilam."
"literatura y en islam." » "literatura y el islam.", "literatura y e islam.", "literatura y en ilam."

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