You can search on either a make, model, dac chip, laser or mechanism. The search is not case sensitive.
Google type searches (e.g. marantz + cdm) are not (yet) supported.
Simply put a few letters of your desired keyword - e.g. if you're searching for KSS240, you can search for KSS2 and all devices using KSS2* will be returned, e.g. KSS213 / KSS210 etc.