It is for sure that many sites are blocked in China as they are emphasizing to block all the networks and websites other than their own.
What i have searched around browser that accessing block sites in China is like a game of cat and mouse as there monitoring aspects are quiet strict.
But though there are many VPN Providers who are enabling users access all the block sites and network from China.
I have found IAPS the most reliable for those who are looking to bypass internet censorship in China.
so my recommendation will be to check IAPS, or you can check Pure VPN and Strong VPN.
They are among the Top categorized best VPN Provider.
Cheers!!! Hope i make things clear for you