Search pulling up entries missing search items

I did a board search for *Tiesto * and I got two recent threads that had no Tiesto located anywhere.
http://boards.straightdope.com/sdmb/showthread.php?t=358282&highlight=Tiesto

and

http://boards.straightdope.com/sdmb/showthread.php?t=366293&highlight=Tiesto

It’s not a big deal as I found plenty of other threads, but I’m curious as to why that might happen. Was there once a post with the text *Tiesto * in it, but it was deleted for some reason?

Both threads do have the word Tiësto however (and both times it’s Yookeroo who posted it).

[QUOTE=Yookeroo]
Wasn’t Richie Hawtin supposed to be DJing (like Tiësto did in Greece)? I thought I read that somewhere.
[/QUOTE]

[QUOTE=Yookeroo]
I don’t think there’s any delay in what they’re listening to over the headphones. They’re listening to the next track in order to time it right (matching the beats).

There’s a difference between DJing (Fatboy) and performing live (Chemical Brothers…although they’ve done the DJ thing too). Although, with DJs starting to use computers to mix, it’s becoming less black & white. And then there’s the who Tiësto In Concert thing, that was some sort of multimedia extravaganza.

Not sure exactly what the Chemical Brothers are doing. But they’re worth seeing live. They do make the button pushing and knob twirling interesting. Great visuals.
[/QUOTE]

It looks like the searching engine is able to match up “Tiesto” with “Tiësto” (note the umlaut(?) over the E) but the highlight engine isn’t.

It looks that way. I guess I’m spoiled by the red highlighting.