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I just have to sort out my visa, do I need to visit the Vietnamese embassy in pnohm penh?, or can I get one in advance from here.

It should be possible to do it either way. The important point is that you need to arrange a visa before arriving and state your intended date of arrival. You can come after this date but not before. So, it seems to depend on how certain you are sure about your itinerary. It's also possible to arrange it online these days (e-visa).

Here's a recent thread on the topic:
/forum/viewtopic.php?id=686057

There's also visa info here:
/en/guide/asia/vie 鈥� visas.html

and more general info here (scroll down to "useful informations"):
/en/guide/asia/vietnam/

You can post your CV and browse some teaching job ads here:
/en/jobs/asia/viet 鈥� ching.html

and here:

I would just get the tourist visa in Phnom Penh. It was a few years ago, and the guard outside handled it, I didn't even go inside. Stopped tuktuk, dropped off passport warily; next day pulled up in tuktuk, guard came over with it and I paid, don't remember how much, tipped him a little.

If you are british you will not need a visa for any stay under 15 days, just make sure you have your exit flight details with you when you leave or if coming by road state at the border you are returning to Cam. if you want a longer stay you will need a visa and Uk citizens can do it online with visa pick up on arrival at the airport, not sure if you can do it if coming by road though

That sounds good, I have made some contact and I鈥檓 having a video call today for some volunteer work, I want to stay longer than 15 days so I鈥檒l check online.
Thank you so much for your time