Hitler and the Nazi staff were exceptionally interested in ancient India and Tibet and sent expeditions to both these places yearly, starting in the 30's, in order to gather esoteric evidence
China used the ancient material for their space program
There could be some truth if else the govts wont be interested. Also to be logical there is the issue of copyright violation
Even Indian government has their own programme in which they are studying ancient Sanskrit and other texts to find out the hidden secrets that will be very helpful for humankind. It is said that DRDO (Defence Research and Development Organisation) is studying an ancient text on making an ayurvedic medicine, that helped human beings to survive without food for long period of time.