Perhaps you should try some spelling variations:
"literatura en de isaac." » "literatura espana de isaac."
"literatura o del islam." » "literatura e del islam.", "literatura a del islam.", "literatura _ del islam.", "literatura o el islam.", "literatura y del islam.", "literatura o de islam."
"literatura de de islam." » "literatura de de isla.", "literatura de e islam.", "literatura de de ilam.", "literatura de fe islam.", "literatura de di islam."

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