I'm guessing this is actually by design, but it is so wrong that I'm going to insist on calling it a bug.
When I enter 'Enya' in the Search field and select 'Show More Results...' it takes me to the full search results page.
But these aren't full search results. I have 10 Enya albums, comprising 95 tracks. The full search results page only lists 30 tracks.
What's the use of a full search results page if it doesn't return everything that fits the search term?