there is a latex based concrete patch product that I have had very good luck with because it gives alittle before it cracks again. Reg, cement will not give one bit.
trowel this out and heavily squash the stuff down in the crack and keep on pushing it in.
Let it dry and your there.
I would venture to say that cracks will be the norm if you have them now.
Consider laying indoor or outdoor carpeting down to hide them. Do not use any ceramic tile, vinyl tile will work also.