The DEMO version only includes 4 pages:
http://webdoctruyen.com
http://webdoctruyen.com/thong-bao-tuyen-nhan-su.html
http://webdoctruyen.com/yeu-cau-truyen.html
http://webdoctruyen.com/category/danh-sach-truyen.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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