Perhaps you should try some spelling variations:
"literatura sobre de isaac." » "literatura hebrea de isaac.", "literatura entre de isaac.", "temperatura sobre de isaac.", "literatura sobre die isaac.", "literatura sobre dos isaac.", "literatura sobre a isaac.", "literatura sobre den isaac.", "literatura sobre d_ isaac.", "literatura sobre dc isaac."
"literatura de e isaac." » "literatura de en isaac.", "literatura de _ isaac.", "literatura de c isaac.", "literatura de el isaac.", "literatura de fe isaac."
"literatura _ de ilam." » "literatura _ de islam.", "literatura _ de chilam."

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 e isaac.") or ("literatura _ de ilam."))) or ("literatura sobre de isaac."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("literatura de e isaac.") OR ("literatura _ de ilam."))) OR ("literatura sobre de isaac.")).
• Removing quotes may allow a broader search: (((( literatura de e isaac. ) or ( literatura _ de ilam. ))) or ( literatura sobre de isaac. )).
• Adding a wildcard symbol may retrieve word variants: (((("literatura de e isaac.") or ("literatura _ de ilam."))) or ("literatura sobre de isaac."))*.