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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("literatura arabe e islam.") or ((("literatura arabe un islam.") OR ("literatura e un islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura arabe e islam.") OR ((("literatura arabe un islam.") OR ("literatura e un islam.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"literatura arabe e islam.\") or (((\"literatura arabe un islam.\") OR (\"literatura e un islam.\"))))".
• Removing quotes may allow a broader search: (( literatura arabe e islam. ) or ((( literatura arabe un islam. ) OR ( literatura e un islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura arabe e islam.") or ((("literatura arabe un islam.") OR ("literatura e un islam."))))*.