For example, you may do this so

with(plots):

A1 :=your plot 1:

A2 :=your plot 2:

.............................

An :=your plot n:

display(A1, A2, ..., An, axes=normal, ...);

Example

with(plots):

A1 := spacecurve([signum(2*Pi-t)*sqrt(2-2*cos(t)), sin(t), 1+cos(t)], t=0..2*Pi, color=red, thickness=3):

A2 := spacecurve([signum(2*Pi-t)*sqrt(2-2*cos(t)), sin(t), 1+cos(t)], t=2*Pi..4*Pi, color=blue, thickness=3):

A3 := spacecurve([2*cos(t), 2*sin(t), 0], t=0..2*Pi, color=green, thickness=3):

display(A1, A2, A3, axes=normal, view=[-3..3,-3..3,-3..3]);