The DEMO version only includes 4 pages:
http://pknamkhoahanoi.com
http://pknamkhoahanoi.com/liet-duong.html
http://pknamkhoahanoi.com/xuat-tinh-som.html
http://pknamkhoahanoi.com/bao-quy-dau.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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