Good going, wow! I'll bet these are them: "Doctor From Lhasa", "Feeding the Flame", and "The Hermit", by T. Lobsang Rampa. The commercial link where I found them is in Acrobat Reader format and uncopyable, but it gives synopses: you can see if they jog your memories.
http://www.skybooksusa.com/c0104/ch19.pdf
By the way, I found that by Googling 'Tibetan monk fiction Ramp'.