The mathematics department has two openings for PhD students in pure mathematics. They are teaching positions, i.e. you have a bigger teaching load than your average PhD student, but to compensate this you get 6 years (3 times 2 years). This also means that you will be required to teach in Dutch the moment you start. Probably that is why there is no English version of the job openings available.
So if you are a 2nd year Master student in Flandres or the Netherlands (or happen to speak fluent Dutch for some other reason) looking for a PhD position, you can apply for these. If you know someone who fits this description, please spread the word.