Việt Nam has highest increase in tourism development index stockbot 0 34 2022.05.30 21:03 http://vietnamnews.vn/economy/1206662/viet-nam-has-highest-increase-in… + 9 https://vietnamnews.vn/rss/economy.rss + 8 Việt Nam’s tourism has stepped up eight places on the 2021 Tourism and Travel Development Index (TTDI), according to the World Economic Forum (WEF) Report.