Roku Search only works with channels that permit the search to access their information. Real world, not very many allow that access, so the Search cannot offer any results from them. It's not something Roku can change. The channel provider has to permit it.
I own nothing, because I'm just another user like yourself. Sorry if I didn't totally understand the problem. The Roku forum admins will be online tomorrow, so hopefully they can offer something further.
Originally impressed with Roku search engine. What happened? Lazy? Too much to handle? A film called Moffie was released and is on Curzon Media channel. Not only can I not find "Moffie" in search, I can't even find Curzon Media. What's up?