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