mysql 全文检索不出来数据？

wuxiaobo_2009

我的mysql ：[root@wuxiaobo ~]# mysql --version
mysql  Ver 14.12 Distrib 5.0.95, for redhat-linux-gnu (i686) using readline 5.1

full-text search ：

mysql> show variables like 'ft_min_word_len';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| ft_min_word_len | 2     |
+-----------------+-------+

mysql> select * from article;
+-----------+-----------------------+-----------------------------------------+
| articleID | title                 | body                                    |
+-----------+-----------------------+-----------------------------------------+
|         1 | MySQL Tutorial well   | DBMS stands for DataBase...             |
|         2 | How To Use MYSQL Well | After you went through a...             |
|         3 | Optimizing MYSQL      | In this tutorial we will show...        |
|         4 | 1001 MySQL Tricks     | 1.Never run mysqld as root.2.....       |
|         5 | MySQL vs. YourSQL     | In the following database comparison... |
|         6 | MySQL Security        | When configured properly,MySQL...       |
+-----------+-----------------------+-----------------------------------------+

mysql> select * from article where match(title,body) against('database');
+-----------+---------------------+-----------------------------------------+
| articleID | title               | body                                    |
+-----------+---------------------+-----------------------------------------+
|         5 | MySQL vs. YourSQL   | In the following database comparison... |
|         1 | MySQL Tutorial well | DBMS stands for DataBase...             |
+-----------+---------------------+-----------------------------------------+

mysql> select * from article where match(title,body) against('well');
Empty set (0.00 sec)

这个怎么空呢？