I have not found Hoya hanhiae to be particularity easy to grow, but that could be because I got off to a bad start by using an extremely course orchid bark mix.  I can pretty much say that my experiment using this mix on a number of Hoyas was pretty much of a failure primarily because I could not keep the humidity levels high enough to make it work.

Having moved the plants to a more conventional peat based mix has worked far better, but I find this plant likes to be kept much drier than other Hoyas that I keep.  Since I am a chronic over-waterer, it is not a good combination!