If you need to view the actual xml that is returned in SharePoint search results, you need to modify the search core results webpart and replace the display properties with this:
<?xml version=”1.0″ encoding=”UTF-8″?>
<xsl:stylesheet version=”1.0″ xmlns:xsl=”http://www.w3.org/1999/XSL/Transform“>
<xsl:output method=”xml” version=”1.0″ encoding=”UTF-8″ indent=”yes”/>
<xsl:template match=”/”>
<xmp><xsl:copy-of select=”*”/></xmp>
</xsl:template>
</xsl:stylesheet>
Note: Remember to backup the old display properties for the search core results webpart in case it was customized before doing this.
Here is the MSDN Link for a more in-depth explanation of this.