This audio references at least one of three works listed here:

A text entitled གཉུག་སེམས་འོད་གསལ་གྱི་དོན་ལ་དཔྱད་པ། , written phonetically as nyuk sem ö sel gyi dön la ché pa, this is a work which analyzes the concept of reality from the clear light of the fundamental, or natural, mind. 

A text entitled ཐེག་ཆེན་ཚུལ་འཇུག , written phonetically as tek chen tsül juk,  this work discusses the nature of entering into the Great Vehicle of Mahayana Buddhism.

A text entitled གཏེར་གྱི་རྣམ་བཤད། , written phonetically as ter gyi nam shé, which discusses the definition of the term "treasure".