Dutch teachers (The Hague)

hello everybody,
I'm trying to conduct two primary data collection investigations for my Masters. I'm doing a study on social media, Dutch youth and the EU so I want to hold focus groups with Dutch youth between 15 to 19. I've sent emails out to schools a while ago but have had hardly any response back. So does anybody have any contact with Dutch teachers who work with HAVO, MBO, VWO etc students- would be truly grateful for any assistance!

Peter