Streetfood laws in vietnam

I genuinely wish you luck but I think you may live to regret it. Trying to go down the legal route can be complicated and expensive and you will still get hassled. The illegal route also has it's own issues and the police will certainly take their share of your profits whichever route you take. On the plus side I visit a friend in the area quite often and it is certainly pretty much devoid of traders. I do know of somebody that went the legal route to cook Naan bread on the street. When he eventually did start trading he immediately got loads of customers and had to employ a local to help cope with demand. After just a few months the local left and opened exactly the same street stand lass than 20yds away . .. . with no licence and seemingly with only the occasional visit from police who obviously took a 'fee'.  Eventually my friend lost all his trade and was constantly hassled by the authorities. Suffice to say that his venture that took almost a year to materialise and, left alone was financially viable, went under in less time than it took to create it. I guess it all comes down to what contacts you have to 'smooth' your path and how determined you are. You have obviously done your financial viability study so you are sure that despite all the potential overheads, material costs etc you will get enough to make it worthwhile so as stated at the beginning of my response. Good luck and all the best if you decide to go ahead.