The booklet linked below is "Protestant Christians in Thailand 2009", a 14 page summary of Marten Visser's research on conversion growth among Protestant churches in Thailand. It is a very quick read and worthwhile for anyone wondering what the most relevant factors for Thai people coming to Christ and churches growing.
Table of Contents
Chapter 1 - Protestant Christians in Thailand
Chapter 2 - Growth of Protestant Christianity
Chapter 3 - Who become Christians?
Chapter4 - Effective evangelism
Chapter 5 -Churches that grow