Help Needed With Searchconditions In A Contains Method

This is my select sentence

SELECT article.* FROM article,
(
SELECT article.articleId
FROM article
WHERE (CONTAINS(article.headline, 'search AND sql AND mysql OR mssql OR postgresql')
OR CONTAINS(article.content, 'search AND sql AND mysql OR mssql OR postgresql'))
) AS searchResults
WHERE article.articleId = searchResults.articleId

and this is the problem
'search AND sql AND mysql OR mssql OR postgresql'

What I wanted it to say was
'search AND sql AND (mysql OR mssql OR postgresql)'
but I cant use parenthesis, and then the meaning or the condition falls apart, then everything with 'mssql' is returned, and not necesarily including the words 'search' and 'sql'

How can I get it to understand, that the OR words belongs together??