ཀུན་ནས་འབྱུང་བའི་སྡུག་བསྔལ་གང་ཞེ་ན།
This refers to the branches of the noble path: correct view, correct thought, correct speech, correct action, correct livelihood, correct effort, correct mindfulness, and correct absorption. Those are known as the eight true topics.
Dharma teaching, noble eightfold path, absolute purity