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 fe isaac." » "literatura de de isaac.", "literatura de _ isaac.", "literatura de c isaac.", "literatura de fde isaac.", "literatura de fen isaac.", "literatura de f_ isaac."
"literatura de e isaac." » "literatura de de isaac.", "literatura de en isaac.", "literatura de _ isaac.", "literatura de el isaac.", "literatura de a isaac."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("literatura de e isaac.") or ("literatura de fe isaac."))) or ("literatura del x islam."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura de e isaac.") OR ("literatura de fe isaac."))) OR ("literatura del x islam.")).
• Removing quotes may allow a broader search: (((( literatura de e isaac. ) or ( literatura de fe isaac. ))) or ( literatura del x islam. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura de e isaac.") or ("literatura de fe isaac."))) or ("literatura del x islam."))*.