Perhaps you should try some spelling variations:
"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 e islam.", "literatura y de islam.", "literatura _ de islam."
"literatura arabe del or arabes del islam." » "literatura arabe del or arabes de islam.", "literatura arabe del or arribes del islam.", "literatura arabe del or arabes e islam.", "literatura arabe de or arabes del islam.", "literatura arabe el or arabes del islam.", "literatura amable del or arabes del islam.", "literatura arabde del or arabes del islam.", "literatura araby del or arabes del islam.", "literatura arab_ del or arabes del islam."

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