When I search for certain items like the Blue Sky Backdrop or Beach Sand, they don't show up anywhere? Is this because they're unavailable to get anymore or? I wasn't sure if this was how it was supposed to be or a glitch. Thanks for any help/answers :)

Hello! 
I just had a look and it appears that there's just no one selling these items at the moment. 
Nothing wrong with your search bar at all ^O^ 

@Zen Thank you for the answer and for looking! :)