Tags MINT Silicon Valley tech firm Paymentwall enters Viet Nam Thursday, May 28, 2015 San Francisco-based digital payment platform, Paymentwall, is among the few Silicon Valley companies to foray into Viet Nam, eyeing the country''s burgeoning Internet and mobile consumer market. Nation to be among 20 biggest economies Thursday, May 15, 2014 Viet Nam and several other emerging nations will be among the 20 largest economies by 2050, a senior foreign business executive has said.