Perhaps you should try some spelling variations:
"literatura en de isaac." » "literatura espana de isaac.", "literatura en den isaac.", "literatura en d_ isaac.", "literatura en dc isaac."
"literatura de de islam." » "literatura de del islam.", "literatura de de isla.", "literatura de e islam.", "literatura de fe islam.", "literatura de di islam."
"literatura de e isaac." » "literatura de en isaac.", "literatura de _ isaac.", "literatura de c isaac.", "literatura de el isaac.", "literatura de fe 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 de islam.") or ("literatura de e isaac."))) or ("literatura en de isaac."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura de de islam.") OR ("literatura de e isaac."))) OR ("literatura en de isaac."))*.
• Removing quotes may allow a broader search: (((( literatura de de islam. ) or ( literatura de e isaac. ))) or ( literatura en de isaac. ))*.