Really? They are protesting because Vietnam government is so weak it already lost Paracels and now it can't even explore for oil in the South China Sea without China cutting its cables. The Vietnamese government is letting its people know weak Vietnam is reality -- so don't protest about it, or you will be arrested and beaten by Vietnamese police.
Can't you accept the reality that Vietnamese are slaves to China for 1000 years and will never be anything more than a rebellious jungle tribe? This is why despite all your brainwashing you are dirt poor, hated by everybody in SE Asia and lost Paracels.
China has already build up troops along the border. China has already conducted air attack drills. I am waiting for Vietnam to shoot at PLA first in anger, then Hanoi and Saigon will be sprayed with Agent Orange again and Vietnamese will become deformed again.