You probably at
least need to change the following parameters in my.cnf
(MySQL only indexes words of length >= 4 by default:
[mysqld]
ft_min_word_len=3
I didn't set this variable and yet the searchindex table contains words like
"aaa", "ada", "yr", "tl", "ei",
"xz", "rz", "lw", etc.
It's the mediawiki software which put this words in the search index
table, but that does not mean mysql can handle it. You have to change
your my.cnf.
Shaihulud