It's impossible to access card detail pages for cards with circumflexes in their names.
For example, searching for cards that start with "Dandân" returns an empty list, and the query is modified to "Dandn" without the "â." The same happens to El-Hajjâj.
Attempting to access card URLs directly fails.
Thumbnails do appear to work: Dandân El-Hajjâj
This failure manifests on Firefox and Chrome, Linux and OS X. Other browsers / OS's not tested.