Reading xpath value error - Lxml

Hi all,

I am trying to crawl the information from this link

http://muaban.net/mua-ban-nha-quan-thu-duc-l5924-c32/quan-thu-duc-ban-nha1lau-2mt-truoc-sau-dg-ng-cong-tru-p-hiep-phu-q9-dt-4x21-5m--id15946781

and this is the code I use

link = "http://muaban.net/mua-ban-nha-quan-thu-duc-l5924-c32/quan-thu-duc-ban-nha1lau-2mt-truoc-sau-dg-ng-cong-tru-p-hiep-phu-q9-dt-4x21-5m--id15946781"
xPath =  "id('pC_DV_tableHeader')/x:tbody/x:tr[4]/x:td[3]"
namespace = {'x': 'http://www.w3.org/1999/xhtml'}

tree = lxml.html.parse(link)
arrayContent = tree.xpath(xPath + "/text()", namespaces=namespace)

if len(arrayContent):
     content = cgi.escape(arrayContent[0].encode("utf-8"))

I use xPath checker add-on of firefox to read the xPath value and the namespace. However, when running the code, I always get the content empty. How can I solve this ? 

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