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