It must have been my mistake -- I'd probably set the language to Dutch in a previous search, and this setting sticks. It's not very obvious in the interface, but I know that, so I admit it is my mistake. (Although I would appreciate the engine being a little more flexible, like offering an extra option: we didn't find any books by this author in the language you specified, but have a look at these...)
Still -- facepalm.
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