Perhaps you should try some spelling variations:
"literatura del e isla." » "literatura de e isla.", "literatura en e isla.", "literatura del e islas.", "literatura del de isla.", "literatura del e islam.", "literatura del v isla.", "literatura del _ isla.", "literatura del c isla."
"literatura al de isaias." » "literatura el de isaias.", "literatura de de isaias.", "literatura en de isaias.", "literatura al de indias.", "literatura al dr isaias."
"literatura e de isaac." » "literatura de de isaac.", "literatura en de isaac.", "literatura y de isaac.", "literatura _ de isaac."

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