p1= ContourPlot3D[x^3+y^4-z^2-1,{x,0,2},{y,0,2},{z,0,2},Contours->{0.0},PlotPoints->{30,30,30}]

p2= ContourPlot3D[x*y+z+z+y+z-3,{x,0,2},{y,0,2},{z,0,2},Contours->{0.0},PlotPoints->{30,30,30}]

Show[p1,p2]