2002 Mazda 626 Clunking noise from the rear

When the car goes over bump or on road which is not flat, there is noise from the rear passenger side, like clunking noise, (I am not sure how to describe the noise. I got the car's rear brake shoes and front brake pads replaced about one month ago. The noise has been there even before I did the replacement. The suspension was no problem when I did the replacement-- the guy in auto shop told me that when they performed the replacement.

I did the 71-point inspection right before I had the car's brake pads and shoes replaced. I was told nothing about the noise.

I am wondering what the problems can be.

Thank you so much!