What version of NX?
And what exactly do you mean by "restore" them? Have they changed appearance or disappeared altogether?
For recent versions of NX:
You can turn the WCS on and off by going to: Format -> WCS -> Display ([kbd]W[/kbd] is the default hotkey).
You can turn the triad on and off by going to: Preferences -> Visualization -> View/Screen -> Part Settings -> show view triad.
I'm on NX8.5, both the CSYS and Triad are on and the blue, green, and red arrows are visible, but there aren't any call-out to tell you what vector you are in.