(SELECT post_id FROM posts_articles
              WHERE MATCH(title) AGAINST('cessor+ used+ on+ Toshiba+ Satellit' IN BOOLEAN MODE)
              ORDER BY title ASC LIMIT 0, 5)
              UNION
              (SELECT post_id FROM posts_articles
              WHERE MATCH(tags) AGAINST('cessor+ used+ on+ Toshiba+ Satellit' IN BOOLEAN MODE)
              ORDER BY title ASC LIMIT 0, 5)