The DEMO version only includes 4 pages:
http://thanhde.info
http://thanhde.info/category/soi-cau-cao-cap.html
http://thanhde.info/3-cang-cao-cap.html
http://thanhde.info/bach-thu-de-mien-bac.html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www.waybackmachinedownloader.com/en/buy-wayback-machine-downloader-recover/ to buy a fully functioning site.
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