mysql> select * from test;
+----+-----------+-------------+----------+---------------+
| id | a         | b           | c        | d             |
+----+-----------+-------------+----------+---------------+
|  1 | adfgadgfg | foo bar baz | ghgfhdfg | yertytrytytry |
+----+-----------+-------------+----------+---------------+
1 row in set (0.00 sec)

mysql> select * from test where match(a,b,c,d) AGAINST ('foo bar baz');
Empty set (0.00 sec)

mysql>