Perhaps you should try some spelling variations:
"literatura en de isla." » "literatura espana de isla.", "literatura en de isaac."
"literatura o de islam." » "literatura e de islam.", "literatura a de islam.", "literatura _ de islam.", "literatura o del islam.", "literatura o e islam.", "literatura o de ilam.", "literatura o de isaacm.", "literatura y de islam."
"literatura de de isaacm." » "literatura de de isaac.", "literatura de e isaac.", "literatura de fe isaacm.", "literatura de di 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 o de islam.") or ("literatura en de isla."))) or ("literatura de de isaacm."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura o de islam.") OR ("literatura en de isla."))) OR ("literatura de de isaacm.")).
• Removing quotes may allow a broader search: (((( literatura o de islam. ) or ( literatura en de isla. ))) or ( literatura de de isaacm. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura o de islam.") or ("literatura en de isla."))) or ("literatura de de isaacm."))*.