There isnât a âbest scriptâ that works every time. The safest answer is the truthful one that matches what you can explain if they ask followâups.
If your soft power activity has already ended and youâre returning without a new course booked, then Option A (âIâm here for a holiday / to travel and spend time in Thailand, and I have sufficient fundsâ) is usually safer than saying youâll âfind another course,â because that can trigger âwhich course/where/when?â questions you canât support yet.
If you have any remote income, perhaps itâs better optionâŚ
You generally donât have to be a Vietnam resident to submit at the Thai Embassy/Consulate in Hanoi â they often accept applications from foreigners who are just visiting.
In practice, they may ask for proof youâre legally in Vietnam (e-visa/entry stamp) and sometimes require in-person submission.
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