Perhaps you should try some spelling variations:
"literatura en de isaac." » "literatura espana de isaac."
"literatura el e islam." » "literatura del e islam.", "literatura e e islam.", "literatura eslava e islam.", "literatura el el islam.", "literatura el e islas.", "literatura el de islam.", "literatura el _ islam."
"literatura de del islam." » "literatura de el 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 en de isaac.") OR ("literatura de del islam."))) OR ("literatura el e islam."))~.
• Removing quotes may allow a broader search: (((( literatura en de isaac. ) or ( literatura de del islam. ))) or ( literatura el e islam. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("literatura en de isaac.") or ("literatura de del islam."))) or ("literatura el e islam."))*.