I agree escaping.
It is too difficult to draw comparisons in developing countries. We don't know enough about the culture and most important previous access to know how much of this is due to increased diagnosis. I think much of it is given that so many are late diagnosis like the article maintains.
Further, if it isn't diagnosis and Vietnam is experiencing an influx in autism cases just as the United States are it is a big step to then say "its because of vaccines". When it is tried to blame autism on vaccination rates in the US it is usually about number of doses, the above links in the OP seem to be about %coverage (which has been high throughout and actually in my opinion leads more evidence to a diagnosis and not to a vaccine related issue).
Also, what else has incresaed in Vietnam in this time period? Cell phone coverage? Wi Fi? The number of microwaves? The number of people participating in message boards? Why focus only on vaccines? My guess is that people do nto want to vaccinate but they do nto want to give up their internet or their iphone. I believe we are doing a disservice by not looking at other things that are also changing and may be playing a role. I have said it before, I wish autism were caused by vaccines, because if it were it could easily be curtailed. But it just isn't that simple and continuing to try to "prove" it through correlation (which is not causation) doesn't change it.
Incidently, just to show you how easy it is to link things to the autism epidemic. I took the rate of autsim for 1992, 1994, 1996, 1998, and 2000 from the CDC and correlated it against the percentage of babies breastfed in the hospital in those years and the number of babies exclusively breastfed at 6 months (available at kellymom). The result was their is a .961 pearsons R for hospital breastfeeding iniation and a .957 Pearson's R for exclusive at 6 months. Both are significant at less than .01 level. Now obviously this is a missue of statistics and I will continue breastfeeding. Just as it is a misuse of statistics to look at vaccination coverage and autism rates so I will continue to vaccinate as well. You can't just look at two things that are both increasing and determine one is causing the other.