Are you able to elaborate on exactly how they are not engaging?
Reason I ask is that what needs adjusting depends on what movement you are requiring.
The hinge adjusters you photographed move the door in/out from the hinge hence, if the door is closed, they would adjust how close/far it is from the frame and ensure it is square. Adjustment is just a simple case of turning the screws with an allen key (usually) - one way will move the door closer to the hinger, the other further away.
However, if the hook arms are not engaging because the door isn't closing far enough (at the top, bottom, or both) then this is more likely due to the guides in the door frame not guiding the rollers correctly with the result that the hook arms end up fouling the frame.
Can you take a picture if the inside of the door frame showing where the hooks and rollers engage?
Mathew