Can I enter Thailand again after a 60-day visa exemption and a 30-day extension, having recently traveled to Vietnam?

Source: Bangkok Post

Get yourself a Fast Track brother. 2,500 THB at Suvarnabhumi. Smooth, skip the queues. Pre-approved.

For Easy Fast Track Seevice:

Are youa tourist.

Basically, if you don't have any recent history of entry from Camb, you don't need to worry.

But, if you fully stay here in Thailand for 90 days in a tourist visa. They might or possibly ask you what's the reason why you want to enter Thailand and might ask a few more depending on the immigration officer. Especially if you came from another neighboring country. My suggestion is, prepare an itinerary (which I saw to the foreigner that they ask last time), hotel booking and an onward ticket. And they might advise you to get a long term visa as well if they feel you want to stay in Thailand longer.

Have a outward bound ticket after the 30 days extension n show proof of funds

Normally you can get many exemptions as you want. But last years it seemed that many people abuse the rules of the exemption visa. So.... the immigration is checken many times and got more strict. They questioning the pattern and frequency.

In your case, after 4 days come back with exemeption....I wish you a lot of luck!!! Be prepared to get a lot of questions.

Yes immigration will advise you. Be prepared to show the 3 things required for entry

Can have a safe entryif needed

You will find out tomorrow but to make sure you should’ve just got a visa out there before coming back

That will likely depend on your previous history of being in Thailand