On the 146, Vfto was "flaps to zero" speed ie min clean , 15° AOB, and Verc was "en route climb", being min manoeuvring speed ie > 15° AOB. I don't recall if the decode for the abbreviations were real or just made-up.
Vx and Vy have recently been discussed here:
http://www.pprune.org/tech-log/44555...mercial-c.html
Sevenstrokeroll, there's no such thing as a stupid question...