I just got stopped at Phuket airport, I had been in Malaysia for a week, my second visa run. I got taken to the boss,. After much persuasion They very reluctantly gave me 30 days but no extension allowed. I was surprised as I have only done it once before, so watch out for that. Im going to Vietnam in 30 days, I just wondered about how simple is it to get a tourist visa there for Thailand? I have S. African passport.
TLDR : Answer Summary
The user reports being granted a 30-day entry at Phuket airport after a visa run from Malaysia, but noted no extension is allowed. They inquire about obtaining a tourist visa for Thailand from Vietnam as a South African passport holder. Commenters provide information about the challenges South Africans face in obtaining educational visas (ED visa) and suggest that it is difficult unless specific conditions are met.