Perhaps you should try some spelling variations:
"literatura en e isaac." » "literatura espana e isaac.", "literatura en de isaac.", "literatura en en isaac.", "literatura en _ isaac.", "literatura en el isaac."
"literatura de den isaacm." » "literatura de de isaac.", "literatura de en isaac.", "literatura de dean isaacm.", "literatura de del isaacm.", "literatura de des isaacm."
"literatura del de isla." » "literatura del de isaac.", "literatura del dean isla."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("literatura de den isaacm.") or ("literatura en e isaac."))) or ("literatura del de isla."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura de den isaacm.") OR ("literatura en e isaac."))) OR ("literatura del de isla."))*.
• Removing quotes may allow a broader search: (((( literatura de den isaacm. ) or ( literatura en e isaac. ))) or ( literatura del de isla. ))*.