Search (within the current ebook) isn't all that hard to implement, but you first need a way to enter the search string. So devices with a real keyboard or a touch screen (virtual keyboard) almost always have search, but it is hit and miss if not. CoolReader under Open InkPot has search, but not under the standard Hanlin firmware (which uses CoolReader for FB2). I have not used it for a while, but I think the LBook firmware for the Hanlin V3 may have search (at least for FB2).
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