fulltext does not return but like does

[ersin kara]

Hi

"Fulltext" version of my query does not return any row
select *
from lyrics2
where match(artist, song)
against('believe' IN NATURAL LANGUAGE MODE);

But "like" version of it, returns many of rows
select * from lyric where song like '%believe%'
'Got To Believe'
'Believe It Or Not'
....

But if i change the search word it returns rows
select *
from lyrics2
where match(artist, song)
against('marilyn' IN NATURAL LANGUAGE MODE);

Why?

Regards