The Vietnamese EV maker's stock has dropped more than 90% from its all-time high.VinFast Auto (VFS -0.22%) briefly became one of the market's hottest electric vehicle stocks when it went public by merging with a special purpose acquisition company (SPAC) last August. The Vietnamese electric vehicle (EV) maker's stock started trading at $22 and skyrocketed to a record high of $82.35 just two weeks later.But today, VinFast's stock trades at less than $5. Like many other SPAC-backed EV makers, it ran of of jui ...