Perhaps you should try some spelling variations:
"literatura espana _ isaac." » "literatura espanola _ isaac.", "literatura mexicana _ isaac."
"literatura del dde isaacm." » "literatura de dde isaacm.", "literatura en dde isaacm.", "literatura del de isaac.", "literatura del de isaacm.", "literatura del dame isaacm."
"literatura _ de isla." » "literatura _ de isaac."

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