Perhaps you should try some spelling variations:
"literatura arabes e islam." » "literatura arabe e islam.", "literatura arte e islam.", "literature arab e islam.", "literatura arabes el islam.", "literatura arabes e islas.", "literatura arabes del islam."
"literatura e de islam." » "literatura de de islam.", "literatura en de islam.", "literatura del de islam.", "literatura e del islam.", "literatura e de isla.", "literatura e de ilam.", "literatura e de islas.", "literatura e ddel islam.", "literatura y de islam.", "literatura o de islam."
"literatura _ de islam." » "literatura _ del islam.", "literatura _ de isla.", "literatura _ de ilam.", "literatura _ de islas.", "literatura _ ddel islam."

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