Vanda parviflora is a variety of Vanda testacea., and should probably be listed as Vanda testacea var. parviflora.
Vanda pumila = Trudelia pumila
Vanda flavobrunnea is considered an unplaced name. Since there are no known specimens, it is impossible to determine whether or not it's the same as the yellow & brown form of Vanda pumila. It has also been suggested that Vanda flavobrunnea may have been a naturally occurring hybrid.