You can’t blame vietnams communist party leaders to be honest. Their largest market is the US, so they don’t have much choice to accept US terms and avoid even higher tariffs which will tank their economy. So they can only bend the knee. Shows the amount of leverage the US has over them(and other countries) by using her large market access as a bargaining chip. So I understand them
The only thing they can do is to try and diversify the markets for their products. However it’s easier said than done, since the US is still the largest market/importer for many goods in the world, and changing markets takes a long time. So their options are not as much as they will like.