A little while ago (before he changed his name again) I went looking to find out what Downvoter had changed his name to on meta, so I went to search for "Manuel" on SO (to find his 'related accounts' to come back to his meta name). To my surprise, no results came up, even though his account clearly exists and the search text should match.
Reproduction steps:
- go to the SO user search page
- search for 'manuel'
- observe the lack of the desired match
This could be simply a lack of a "page 2" link, since there are sufficient matches to fill the page. (If results were sorted by reputation, then Juan Manuel would appear at the top of the search results, but he should at least be somewhere.)