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WikiPedia: Net Promoter Score http://blog.hearme.vn/2018/02/CSAT-la-gi.html https://www.checkmarket.com/blog/net-promoter-scor... https://www.netpromotersystem.com/about/measuring-... https://e-smile.vn/tin-tuc/chi-so-no-luc-cua-khach...