Selexyz is a group of bookshops that were until recently independent. I can't say if they still are but it looks most like a purchasing/marketing group of semi-independents. Most (not all of them - for example Verwijs in The Hague isn't) are in university cities/towns. Judging from the ones I know they sell books in both Dutch and English, maybe other languages too if enough demand. The website seems to be Dutch only and doesn't format well with my Firefox version so maybe I've missed something
For a list of addresses
http://www.selexyz.nl/pages/content/...000213/wo.aspx
Tokkeh