The DEMO version only includes 4 pages:
http://dangdepvietnam.com
http://dangdepvietnam.com/kham-pha-suc-khoe-tinh-khiet-tu-yen-sao-minest-dinh-duong-tan-goc-huong-vi-tinh-te-cho-cuoc-song-song-khoe-manh.html
http://dangdepvietnam.com/9x-an-suong.html
http://dangdepvietnam.com/9x-quy-nhon-bang-gia-chinh-sach-ban-hang-uu-dai.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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