Perhaps you should try some spelling variations:
"literatura e de isla." » "literatura de de isla.", "literatura en de isla.", "literatura del de isla.", "literatura e de isaac.", "literatura y de isla.", "literatura o de isla."
"literatura _ de islam." » "literatura _ del islam.", "literatura _ de ilam.", "literatura _ de islas.", "literatura _ de isaacm.", "literatura _ ddel islam."
"literatura _ e islam." » "literatura _ el islam.", "literatura _ e islas.", "literatura _ del islam."

You may be able to get more results by adjusting your search query.

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