Any expats here come from the US professional services industry?

I work at a firm in the US will be transitioning to work in Vietnam soon.  Very excited!  Curious if there are any other people who used to work in the professional services industry in the US and are now working in Vietnam?  What's your experience with having to serve clients in a country where the legal framework is weak and authoritative guidance with regard to legal/accounting rules is lacking?

What sorts of professional services?  IT/PS?