The Vietnamese, even most of the government, are Americophiles. Clinton and Bush leaned constantly on Hà Nội to ease up on the controls and Hà Nội continually eased restrictions. Speech became pretty much free at street and coffeeshop level. The travel restrictions pretty much disappeared. They are still there "on paper" but are mostly ignored. Obama hates Việt Nam because of its affinity for America and Americans. He cold shouldered Việt Nam and the government backslid some. There came more conflict with the Catholicsand the Buddhists. speech was restricted political arrests became much more common. I see this year that things have become more relaxed again so Trump is either leaning on them properly a la Bush and Clinton or the Việts qre anticipating it and trying again to buddy uup to America.
I fully agree with you that communism is incompatible with Vietnamese culture. the vietnamese here in Warsaw are very hard working and trustworthy and individualistic. Good people