Perhaps you should try some spelling variations:
"literatura el e islam." » "literatura del e islam.", "literatura e e islam.", "literatura eslava e islam.", "literatura el el islam.", "literatura el e islas.", "literatura el de islam.", "literatura el _ islam."
"literatura en del islam." » "literatura espana del islam.", "literatura en el islam."
"literatura de de isaac." » "literatura de fe isaac.", "literatura de di isaac."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"literatura de de isaac.\") OR (\"literatura el e islam.\"))) OR (\"literatura en del islam.\"))~".
• Removing quotes may allow a broader search: (((( literatura de de isaac. ) OR ( literatura el e islam. ))) OR ( literatura en del islam. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("literatura de de isaac.") OR ("literatura el e islam."))) OR ("literatura en del islam."))*.