I'm adding a new release under http://musicbrainz.org/release/add?artist=f468b272-235e-4d31-851a-a1d9859ac89a and have tweaked track 4 to have the correct artist credit (韋雄／鍾嘉欣) yet I can't find the recording that already exists to match with it: http://musicbrainz.org/recording/1c0ee1e3-c3c7-4c04-84a0-80d75b78330d All I get for the track is "(No Results)" and "Not found? Try again with direct search." but a direct search also yields nothing.
I notice that I can't even find the recording by searching for "戀愛令人心痛" via http://musicbrainz.org/search?query=%E6%88%80%E6%84%9B%E4%BB%A4%E4%BA%BA%E5%BF%83%E7%97%9B&type=recording&limit=25&direct=1 regardless of whether I do a direct search or not. I can find the work by the same though (but it gets a score of 10, even though it's a perfect string match).
I added the release now at http://musicbrainz.org/release/74a84fad-49be-44e5-8975-c7add2095abf if it might help to see exactly what I was attempting. I'll go ahead and merge the recordings manually, so don't be surprised it looks right at a later date.
I cannot reproduce this on the current master branch. I don't have that particular recording in my local database, but searching for similar recordings returns them without trouble.
The link to /search?query in the first comment on this ticket currently returns the expected result on the production servers at http://musicbrainz.org.
I'm still seeing this with the recording tab's indexed search for loads of tracks. They've all been in the database for months/years so the normal indexed search finds them just fine.
The first track of http://musicbrainz.org/release/0385f276-5f4f-4c81-a7a4-6bd7b8d85a7e for example doesn't return any results with the indexed search even though there should be three separate recordings (just let it search for the text that's already in the input box). That example should be in your test data.
I can still reproduce this:
1. Edit any recording, I picked http://musicbrainz.org/release/a2b21df9-0841-3095-b1dc-47ee20807cb2/edit
2. In the advanced tracklist editor, change the title to 戀愛令人心 and the artist credit to "韋雄 & 鍾嘉欣" (2 credits, both are found with indexed search)
3. Go to recordings and click the red "Select" button for track 1, then "Search for recordings"
4. Neither the indexed or direct search finds a recording.
Expected that http://musicbrainz.org/recording/bcf548d2-3afd-4fac-83b1-c1cd5c62cb1f or http://musicbrainz.org/recording/9de2e19a-5a82-4696-bd2d-cca61addb9fc be found (currently being merged)
Ok, I can reproduce it now, thanks for the update!
A work around is in review, and available on http://test.musicbrainz.org .
NOTE: bugfixes for issues marked closed in jira may not be deployed to production yet. This fix should go out today, please see http://blog.musicbrainz.org/ for updates to the production server at http://musicbrainz.org.