3 months in Vietnam would work then 3+ months Cambodia or other. Philippines sounds like a toilet.
I don't understand this?
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Below is the full list of 25 countries +Kazakhstan that are exempted from visa requirement:
Brunei, Myanmar, Belarus, Denmark, Finland, France, Germany, Italy, Japan, Norway, Russia, South Korea, Spain, Sweden, The UK, The Philippines, Cambodia, Indonesia, Kyrgyzstan, Laos, Malaysia, Singapore, Thailand, Chile, Panama.
https://vietnam.travel/plan-your-trip/visa-requirements