It is the truth, dude, that Paracel and Spratly is part of territory of Vietnam in era of Nguyen Dynasty Vietnam's from long time ago in the past.
China dream is that China tried steal Islands and reefs of Vietnam by force and build artifact Islands there. Chinese is invader in modern time.
Vietnam (north) was a part of China (Qin Dynasty, Han Dynasty...) for thousands of years. When you divorce, you haven't divided your properties in your way, have you?
You PM Fan said those islands were China's just a few dozens years ago, for one reason or the other.