AFter all i used ??
SELECT DISTINCT p.* FROM $wpdb->posts p, $wpdb->postmeta m, $wpdb->posts p1, $wpdb->postmeta m1, $wpdb->posts p2, $wpdb->postmeta m2
WHERE p.post_type = 'post'
AND p.ID = m.post_id
AND m.meta_key = 'x1'
AND m.meta_value = 'x2'
AND m1.meta_key = 'y1'
AND m1.meta_value = 'y2'
AND m2.meta_key = 'c1'
AND m2.meta_value = 'c2'
AND (p.post_content LIKE '%$search%' OR p.post_title LIKE '%$search%')
ORDER BY p.post_date DESC