21 days for 3 countries is FAR too short. Stick to 2 countries only.
Not exactly 3 weeks though. I can certainly spend one month or even more. What would you recommend?
You can easily spend 20 or more days just in Lao. I would concentrate on Lao and Cambodia and leave Vietname for another time.
I second Rufus suggestion. Both Laos and Cambodia are lovely country and you can see a lot there. Vietnam is quite big with the sights so well spread over the country, it will be more difficult to see lots there. I am currently travelling through Vietnam, and I feel spending only a week here would feel far too rushed...
I stayed around 7-8 weeks in Laos over 3 years, and still have things outstanding, so it shows the less time you spend in each country, the less you experience it.
Unless you do a tick box exercise, I feel less is more when travelling
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