As with many of the other countries on this list, precise population numbers do not seem to be available. What is clear is that in 2010 the tiger population was thought to be in excess of 100. Their current population is around 177 ( the population grew by 50% over the last 2 years).
Rapid growth of the population appears to be possible thanks to an improvement in their habitats health.
In 2011 vietnams population of tigers was estimated at 20. These are of the Indochinese sub species, unfortunately with only around 350 left across all countries it lives in, this sub species could still be lost. It should be noted, that the last photo was in 1997, and it is considered functionally extinct.
Given populations of tigers in nearby countries, if Vietnam improves its forest health the tiger is likely to return on its own in due course.
Unfortunately, there is little more to say about the tiger in Vietnam