Perhaps you should try some spelling variations:
"literature arab e isela." » "literatura arabe e isela.", "literature early e isela.", "literatura para e isela.", "literature arab e isla.", "literature arab e isolda.", "literature arabe e isela.", "literature arab _ isela.", "literature arabes e isela."
"literatura den e isaac." » "literatura en e isaac.", "literatura del e isaac.", "literatura e e isaac.", "literatura den en isaac.", "literatura den _ isaac.", "literatura den c isaac.", "literatura den el isaac.", "literatura din e isaac."
"literatura de de isaac." » "literatura de den isaac.", "literatura de d_ isaac.", "literatura de dc isaac.", "literatura de fe isaac.", "literatura de di isaac."

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