Perhaps you should try some spelling variations:
"literatura del de isaac." » "literatura de de isaac.", "literatura en de isaac."
"literatura del dean isaac." » "literatura de dean isaac.", "literatura en dean isaac.", "literatura del dan isac.", "literatura del en isaac.", "literatura del dano isaac.", "literatura del dia isaac."
"literatura e e islas." » "literatura de e islas.", "literatura en e islas.", "literatura e el islam.", "literatura e de islas.", "literatura el e islas."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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