It's honestly pretty embarassing he got as far as he did. He was clearly untrained and thought that the Viets would be too mellow to stop him, with tech that was too poor to track him. He was right, unfortunately, on the first count. From the very beginning where he completely failed to knock out the guard with a barrage of head strikes using a weapon but moved on to the robbery anyway (and to be fair, the guard acted equally incompetently after getting up) it was clear that all it would take to stop this guy was one dude tackling or holding onto him, but it didn't happen. He got away until they tracked him by video.
Not sure what he is thinking... If he's broke and want to get back to the US, he coulda just went to the US embassy and apply for repatriation loan.