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My husband and I have been traveling around the world for 30 years trying to find a country to move to permanently when we retire. As we've narrowed down the list we have made return trips to the top contenders and looked into immigration requirements only to find out it was too expensive for the visa (Australia) or the political situations in those countries have changed (Thailand). There's a lot more involved to living abroad than just showing up.

Here is a website that may interest you:
http://www.expatforum.com/
Sign up, start reading and asking questions.

For Vietnam here is the company I used for a 2 week private tour with a guide who traveled with us:
http://www.vietnamvacations.com.au/
They have an office in Australia and Hanoi.