Perhaps you should try some spelling variations:
"literatura en del islam." » "literatura espana del islam.", "literatura deln del islam.", "literatura en el islam."
"literatura e del islam." » "literatura del del islam.", "literatura e el islam.", "literatura de del islam.", "literatura 5e del islam.", "literatura y del islam."
"literatura de de isaac." » "literatura de fe isaac.", "literatura de di isaac."

Try widening your search to All Fields.

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 isaac.") or ((("literatura e del islam.") OR ("literatura en del islam."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("literatura de de isaac.") OR ((("literatura e del islam.") OR ("literatura en del islam.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"literatura de de isaac.\") or (((\"literatura e del islam.\") OR (\"literatura en del islam.\"))))".
• Removing quotes may allow a broader search: (( literatura de de isaac. ) or ((( literatura e del islam. ) OR ( literatura en del islam. )))).
• Adding a wildcard symbol may retrieve word variants: (("literatura de de isaac.") or ((("literatura e del islam.") OR ("literatura en del islam."))))*.