The Vietnamese government and establishments don't actively censor pro-Israel content, neither do they actively censor anti-Israel content. It's just that the kinds of (Vietnamese-speaking) people who are pro-Israel are usually also pro-West, pro-Trump, reactionary, anti-communist, and anti-Vietnam. Most Vietnamese hate these kinds of people. But most of these anti-Vietnam people also live in the West so we can't really do anything about them.
I would also caution you against collecting news about Vietnam from hearsays and tabloids on social media (such as Twitter/X or Reddit). If you really care, do research carefully. Don't take words as face value.