Perhaps you should try some spelling variations:
"literatura del e isaac." » "literatura de e isaac.", "literatura del en isaac.", "literatura del _ isaac.", "literatura del c isaac.", "literatura del v isaac."
"literatura en de isaac." » "literatura de de isaac.", "literatura espana de isaac.", "literatura en den isaac.", "literatura en d_ isaac.", "literatura en dc isaac."
"literatura a dde isaacm." » "literatura al dde isaacm.", "literatura e dde isaacm.", "literatura de dde isaacm.", "literatura a dden isaacm.", "literatura a dd_ isaacm.", "literatura a ddc isaacm.", "literatura a de isaacm."

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