For the interview try these locations:
The Vietnamese instructor could be Sensei Dang Thong Tri
. He taught at the Budo Education Center in Sacramento in the early 1970's. He might be the elder brother of Sensei Dang Thong Phong
. I can't say if this is the same individual. However a web site said:
Master Tri also studied under the founder of aikido, O-Sensei Morihei Ueshiba. O-Sensei was so impressed with Master Tri's remarkable personal qualities that he bestowed upon Master Tri the honorary name "Ten Shin" --pure spirit.
Sensei Dang Thong Phong's association is called Tenshinkai Aikido.
Is this coincidence?
In the case where Sensei Dang Thong Tri is the person you'd like to find more about, you can try to contact Lynn Seiser
a member of this forum and Tenshinkai.