I would use the word 'truce' instead.
Change is inevitable and the commies knows it. Right now, the commies are taking the pragmatic path -- the allowance of greater economic freedom. Ideologically, just like the ChiComms, they know the -isms of Marx, Lenin, and Mao are done for, at least for this hundred yr period, anyway. Tossing bread in front of the people and temporarily their minds will be focused on the bread and their physical hunger.
So for now, while the economic bread from the likes of Intel, Samsung, and Sony are keeping the Vietnamese people occupied, the country's top minds are busy wondering what to do next, not about keeping the Communist Party in power when they know this -ism is nothing but an empty vessel that no one want to fill, but about where to take the Vietnamese other than the -ism of the Americans. The sad part is that there are no other alternatives. Everyone know of the other empty vessel -- socialism with Chinese characteristics. What will we see next -- socialism with Vietnamese characteristics ? It will be an even greater joke for both peoples.
Like it or not, the best path for true Vietnamese independence and prosperity is to break away from the failed -isms of Marx, Lenin, and Mao, and if not the adoption of the bicameral political system of the US, then at least the parliamentary model that most democracies are using today. Let the Chinese be two-faced about their system. The world snickers behind their palms at the Chinese leaders whenever they changes from the coat and tie to the Mao suit and even ordinary Chinese rolled their eyes at the costume changes in the Chinese political theater. A Viet Nam with the parliamentary democratic system and capitalism will go the way of Japan, South Korea, and Singapore. The Chinese are already contemptuous of those countries anyway, so what does Viet Nam have to lose ?