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