Perhaps you should try some spelling variations:
"literature arab de isaac." » "literatura arabe de isaac.", "literature early de isaac.", "literatura para de isaac.", "literature arab den isaac.", "literature arab d_ isaac.", "literature arab de isaiah.", "literature arabe de isaac.", "literature aras de isaac.", "literature arabes de isaac."
"literatura de e isaac." » "literatura de en isaac.", "literatura de _ isaac.", "literatura de e isaiah.", "literatura de el isaac.", "literatura de fe isaac."
"literatura de c isaac." » "literatura de _ isaac.", "literatura de en isaac.", "literatura del c isaac.", "literatura de a isaac."

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