You can't; one shader visible at a time.
But depending on the use case, you can find a way around it if you need to.
If you need to switch between different shaders for different effects, you can attach shaders to different textures and switch out the visibility for each texture/shader as needed to achieve desired effects.
If you want all the effects at once, that's not really possible unless you consolidate all the shader code into one shader in a nice way. Or find another compromise.