HCMC traffic is denser than Hanoi's. Pick a steady walking pace, never sprint, and let the motorbikes flow around you.
The single best technique is to commit. Step off the curb at a normal walking pace and continue without sudden stops. Drivers track your trajectory and adjust.
At Ben Thanh roundabout or Nguyen Hue intersections, follow a local. After a couple of crossings you'll have the rhythm.