ma ha yo ga'i tan tra sde bco brgyad

མ་ཧ་ཡོ་གའི་ཏན་ཏྲ་སྡེ་བཅོ་བརྒྱད Eighteen Tantrapitakas of Mahayoga. As enumerated in Longchenpa, sngags kyi spyi don tshangs dbyangs 'brug sgra pp. 27-28, they comprise:

• three tantras representing the body, speech and mind of buddha-body-- respectively glang po rab 'bog, glang po chur 'jug, and Buddhasamayoga,
  
• three tantras representing the body, speech and mind of buddha-speech-- respectively ri bo brtsegs pa, pad ma dbang chen, and Candraguhyatilaka,
  
• three tantras representing the body, speech and mind of buddha-mind-- respectively rtse mo 'dus pa, gcig las 'phros pa, and Guhyasamaja,
  
• three tantras representing the body, speech and mind of buddha-attributes-- respectively sgron me 'bar ba, bdud rtsi sa ma ya 'bum, and Shriparamadya,
  
• three tantras representing the body, speech and mind of buddha- activities-- respectively dpal phreng dkar po, ma mo rgyud lung, and bid yo ta ma la 'bum sde,
  
• and three tantras representing of body, speech and mind of all these in general-- respectively thabs kyi zhags pa, dam tshig bkod pa, and gsang ba snying po GD