Perhaps you should try some spelling variations:
"literatura des x isla." » "literatura del x isla.", "literatura es x isla.", "literatura desde x isla.", "literatura des e isla.", "literatura de x isla."
"literatura de dades islass." » "literatura de dados islass.", "literatura de datos islass.", "literatura de danos islass."
"literatura de de isla." » "literatura de de isaac.", "literatura de fe isla.", "literatura de di isla."

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