Perhaps you should try some spelling variations:
"literatura del de isaac." » "literatura de de isaac.", "literatura del dean isaac."
"literatura en de isaac." » "literatura de de isaac.", "literatura espana de isaac.", "literatura den de isaac."
"literatura e el islam." » "literatura de el islam.", "literatura en el islam.", "literatura es el islam.", "literatura e el islas.", "literatura e el isla."

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 en de isaac."))) or ("literatura e el islam."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura del de isaac.") OR ("literatura en de isaac."))) OR ("literatura e el islam.")).
• Removing quotes may allow a broader search: (((( literatura del de isaac. ) or ( literatura en de isaac. ))) or ( literatura e el islam. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura del de isaac.") or ("literatura en de isaac."))) or ("literatura e el islam."))*.