I want to know the answer to the following question:
Though he urged for demonstrations in Vietnam, Nguyễn Văn Hải was charged with what crime?
All the background I'm provided with is that "Prior to the rally, seven anti-China protestors were arrested in Hanoi after unfurling a banner and shouting "Boycott the Beijing Olympics" through a loudhailer at a market.". Is that enough to answer the question?
Answer: no