As the title says, for example, I can search communities from lemmy.world, but not all show up when searched, a few show up in the communities search. Why?
Try to look up the ‘full community’ URL and try to press “next” or “search” again, sometimes it takes a little to federate
For example: “https://lemmy.world/c/selfhosted”
In the search bar
That worked for one of the communities I wanted, but I can’t add a different one from the same instance no matter what I do
I wanted to sub to the i2p community from that lemmy.world, now it works, but I found a different one as an example: https://lemmy.world/c/minecraft
Sometimes, you have to wait a little while for the search result to appear. I think it appears quickly if other users on this instance have already subscribed to it, since the content has been copied locally. If no one has, then it has to go look it up remotely, and I assume that that takes longer.