When looking for a master thesis project, the best thing you can do is privately speak to all supervisors. They can Taylor a project specially to your personal interests. To get an idea of what kind of projects are available, some old master thesis proposals for the PME department can be found in the links below.
The more current projects are uploaded to the brightspace course for the master thesis, with course code ME56035. This course together with the literature survey page (ME56010) also contain more useful information.