You might read here.
http://www.ishr.org/activities/religiousfreedom/christiansinvietnam.htm
"However, the International Society for Human Rights (ISHR) observes with great concern that Vietnam has discriminated, harassed and persecuted religious communities for years. ISHR records that in 2001 alone several hundred believers - among them all important religious leaders - were arrested or put under house arrest."
The ISHR is a non-profit NGO that bases its work on the UN Declaration of Human Rights.
I have no doubt about that. Vietnam is far from paradise. My main complaint with this thread, and most of the people posting on it, is they completely trivialize Vietnam's real problems by inventing bogus atrocities. Stick to the facts and there are plenty of reasons to criticise Vietnam. Making up 'fake but accurate' lies wishing they were true simply cheapens the message and makes one into a fool.