Perhaps you should try some spelling variations:
"literatura del del islam." » "literatura en del islam.", "literatura del el islam.", "literatura edel del islam.", "literatura del de islam.", "literatura del dem islam."
"literatura el de isaac." » "literatura en de isaac.", "literatura e de isaac.", "literatura eslava de isaac."
"literatura de de isaias." » "literatura de de indias.", "literatura de fe isaias.", "literatura de di isaias."

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 el de isaac.") OR ("literatura del del islam."))) OR ("literatura de de isaias."))~.
• Removing quotes may allow a broader search: (((( literatura el de isaac. ) or ( literatura del del islam. ))) or ( literatura de de isaias. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("literatura el de isaac.") or ("literatura del del islam."))) or ("literatura de de isaias."))*.