Perhaps you should try some spelling variations:
"literature arab de isaac." » "literatura arabe de isaac.", "literature early de isaac.", "literatura para de isaac.", "literature arabe de isaac.", "literature aras de isaac.", "literature arabes de isaac."
"literatura e de isaacs." » "literatura de de isaacs.", "literatura en de isaacs.", "literatura del de isaacs.", "literatura e de isaias.", "literatura e de islas.", "literatura e e isaac.", "literatura _ de isaacs.", "literatura o de isaacs."
"literatura y de isaacs." » "literatura y de isaias.", "literatura y de islas.", "literatura y e isaac."

Try widening your search to All Fields.

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