The document discusses C-segment vehicle sales in Thailand for May 2015. It lists popular C-segment vehicles like the Toyota Corolla, Mazda 3, and Honda Civic. While the source, Thai AutoBook Research, tracks year-to-date sales of these vehicles by manufacturer, it does not provide the specific sales numbers. The document shares that market share data is available but no other details on the overall C-segment market performance in Thailand for the given month.