The Vietnamese are not backward in coming forward, especially when it comes to asking for donations and their pièce de resistance is the sob story.
Probably the day after travellers first started trickling into the Prince Hotel just after Doi Moi, the local hustlers worked out that these young naive things would fall for anything involving "Communists" or "re-education camp".
Possibly back then there were a couple of ex-lawyers driving cyclos. Back in 1990 that would have made them ... how old? Let's see, 30 years old in 1975 ... so that would be 45. Plausible.
Seventeen years later ... they'd have to be 62 - at the absolute youngest. When your interlocutor is giving you his "doctor" story then weigh up ... is he at least 62? If he is then you'd be advised to take a taxi! (Well you'd be *always* advised to take a taxi, but that's a subject for another tip.)
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Of course there are scams here, minor and major, but remember that many people here have to live for several days on what you would spend on a latte and muffin!
Furthermore, I would rather be relieved of my cash by invention rather than at knifepoint which is more likely to be the case in my own country, and I'm sure your's.
Grow up, mate, and look at the myriad positive aspects of this dynamic country in transition.