Unable to search on unbuyable items.

Is there any particular reason that searching on un-buyable items, such as the "Enchantment: Sated Devourer" yields no results? The items are implemented in the shop and you can reach them by clicking on the Devourer, why not be able to search on them? As a new player I found it pretty frustrating not being able to find some of the items suggested online and I see no advantage of this. Please enlighten me!

(rip title: Search for*)