phyi thub pa rgyud kyi theg pa gsum

2nd missionary period (11th to present), second diffusion of buddhism in tibet, later development, later spreading of the dharma [JV]

1) the 2nd missionary period/ the later spread/ propagation (of the doctrine; 2) dusting, wiping, cleansing [IW]

the later spreading of the Dharma; the second missionary period / the later spread / propagation [of the doctrine] [RY]