One of the best pieces of advice for choosing a school that is a good fit for your child is to talk with parents about their experiences. The tuition costs of some of the private schools are quite high, while the value of the education and teacher qualifications may be comparable at some of the less expensive schools.
One starting point for speaking to other parents of school-age children would be in the group Parenting in Hanoi that post discussions and meet ups on the New Hanoian website.
http://tnhvietnam.xemzi.com/en/group/show/283/Parenting-in-Hanoi
