Perhaps you should try some spelling variations:
"literatura e de isaac." » "literatura en de isaac.", "literatura del de isaac.", "literatura de de isaac.", "literatura y de isaac.", "literatura _ de isaac."
"literatura e el islam." » "literatura en el islam.", "literatura del el islam.", "literatura es el islam.", "literatura el el islam."
"literatura de el islam." » "literatura den el islam.", "literatura des el islam.", "literatura del el islam."

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