Perhaps you should try some spelling variations:
"literatura e de islam." » "literatura en de islam.", "literatura del de islam.", "literatura e del islam.", "literatura e e islam.", "literatura e de ilam.", "literatura e de isaacm.", "literatura _ de islam.", "literatura o de islam.", "literatura a de islam."
"literatura de de islam." » "literatura de del islam.", "literatura de e islam.", "literatura de de ilam.", "literatura de de isaacm.", "literatura de fe islam.", "literatura de di islam.", "literatura d_ de islam.", "literatura do de islam.", "literatura da de islam."
"literatura y de isla." » "literatura y de isaac."

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