Perhaps you should try some spelling variations:
"literatura del de isla." » "literatura de de isla.", "literatura en de isla.", "literatura del de isaac.", "literatura del dean isla."
"literatura e de isla." » "literatura de de isla.", "literatura en de isla.", "literatura e de isaac.", "literatura y de isla.", "literatura o de isla."
"literatura _ de islam." » "literatura _ del islam.", "literatura _ e islam.", "literatura _ de ilam.", "literatura _ de 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 e de isla.") OR ("literatura del de isla."))) or ("literatura _ de islam."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura e de isla.") OR ("literatura del de isla."))) OR ("literatura _ de islam.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"literatura e de isla.\") OR (\"literatura del de isla.\"))) or (\"literatura _ de islam.\"))".
• Removing quotes may allow a broader search: (((( literatura e de isla. ) OR ( literatura del de isla. ))) or ( literatura _ de islam. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura e de isla.") OR ("literatura del de isla."))) or ("literatura _ de islam."))*.