Pretty much the same answer as the accented characters earlier. The default
index expression is "\alnum{2,30}" which is 2-30 alphanumeric characters.
If you want to search for other things, you need to index them.
-k"[\alnum&]{2,30}"
See http://www.thunderstone.com/gw25man/node40.html
Also, if you view the source of the results page when you don't get
expected hits, you may see more detailed error messages indicating why.
(At least in cases like this).