https://github.com/jenkinsci/jenkins/pull/5051 significantly changed the behavior of the plugin search. It no longer treats tokens as separate search terms, but just does a really basic substring search for the entire query.

So searching for "build token" will not find https://plugins.jenkins.io/build-token-root/ because its display name is "Build Authorization Token Root". "build-token" works because that's a substring of the plugin ID.

"Pipeline Groovy" finds nothing (no colon), neither does "Pipeline CPS".

All of this worked in 2.269 and doesn't in 2.270.