Hmmf, that's disappointing. I imagine it's because Yahoo haven't crawled that section of HOL etc yet.
Yep, if you go to www.yahoo.com
and search for site:hol.abime.net "green five" you don't get any results either so this appears to be the case.
Beyond using Yahoo's advanced operators
there's nothing you can do about this unfortunately.
Thanks for the Obligement tip. I've added it to the list.
Edit: Google offer a similar service
though I can't get "Green Five" to appear with this either, yet you get a few hits using Google's non-customised search engine.