Full throttle did not work. why?
When speaking about jets, we refer to "thrust" or "power". Throttles are for recip engines.
The crew did initiate a go around, but gave the aircraft very little time to respond. You have to consider two things here:
1. Engine spool-up time which, even at flight idle, takes a few seconds to come to full thrust.
2. Momentum - you simply cannot take any mass traveling in a particular direction and expect to change its vector instantaneously. It takes time, once the engines are to TOGA, for the airplane to start responding.
The crew gave the 777 about 1.5s to do the above two. You'd be hard pressed to get any aircraft to perform in the time frame.
Its important for a pilot to be a few seconds ahead of the aircraft at all times. Being proactive instead of reactive is the key. Once you get behind the aircraft, you're pretty much screwed.