Perhaps you should try some spelling variations:
"literature arab e isla." » "literatura arabe e isla.", "literature early e isla.", "literatura para e isla.", "literature arabe e isla.", "literature arab _ isla.", "literature arabes e isla.", "literature arab e islas.", "literature arab de isla.", "literature arab e islam."
"literatura del de islam." » "literatura en de islam.", "literatura del del islam.", "literatura del de isla.", "literatura del e islam.", "literatura del dean islam.", "literatura del de islasm.", "literatura del dde islam.", "literatura del de islamm."
"literatura de de isaacm." » "literatura de de isaac.", "literatura de e isaac.", "literatura de fe isaacm.", "literatura de di isaacm."

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