They are blocking Google cause they afraid about the truth about corruption and what not as well as anti-commies stuff on the net.
As for what you can do about it, well, seem pretty much nothing to me as I did come from a commie country and I know all too well about them. Unless the whole 90% of the country revolt. Other than that, they will kill if you try.
I remember a couple years ago, my old commie country which is Vietnam also block various site on the net. One of them that know of is all site from Geocities. I also heard various news sites also. I think they unblock those sites I mentioned above now, not really sure. But they are still blocking various other sites now.
That's what happen in a commie country for those of you that don't know. They also decide what you should know and what you should not. I remember when I was young and go to school there, man, they start the brainwash immediately when you enter 1st grade. The history book now looking back are all filled with propaganda and sh*ts. Man, I do really feel sorry for those who had to live in such a place.