Perhaps you should try some spelling variations:
"literatura del x islam." » "literatura en x islam.", "literatura del e islam.", "literatura del _ islam.", "literatura del el islam.", "literatura del xx islam.", "literatura del xv islam.", "literatura del xi islam."
"literatura de de isla." » "literatura de de isaac.", "literatura de di isla."
"literatura de fe isla." » "literatura de e isla.", "literatura de de islam.", "literatura de de islas."

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 de de isla.") OR ("literatura de fe isla."))) OR ("literatura del x islam."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"literatura de de isla.\") OR (\"literatura de fe isla.\"))) or (\"literatura del x islam.\"))~".
• Removing quotes may allow a broader search: (((( literatura de de isla. ) OR ( literatura de fe isla. ))) or ( literatura del x islam. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("literatura de de isla.") OR ("literatura de fe isla."))) or ("literatura del x islam."))*.