This outlines them. VNAF tactics were modeled very closely on Soviet, with some tactical modifications. Mostly slashing attacks, one or two (unlikely) passes controlled by GCI. I can scan some parts of the book if need be, diagrams and such.
I'll drag it out and write up some more tonight.
http://www.amazon.com/Clashes-Combat-North-Vietnam-1965-1972/dp/1591145198