Perhaps you should try some spelling variations:
"literatura arabe e islam." » "literatura breve e islam.", "literatura de e islam.", "literatura e 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 el OR arabes del islam." » "literatura arabe el OR arabes de islam.", "literatura arabe el OR arribes del islam.", "literatura arabe el OR arabes e islam.", "literatura arabe en OR arabes del islam.", "literatura arabe et OR arabes del islam.", "literatura caribe el OR arabes del islam.", "literatura arabes el OR arabes del islam.", "literatura arabe del OR arabes del islam.", "literatura arabe enl OR arabes del islam."

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