"more" tag, enclosed tags and do_shortcode

Let’s see, I’m trying to use enclosed tag of advanced spoiler plugin which is [spoiler][/spoiler]. I think I should use do_shortcode which is works fine with shortcode of my own plugin, for example do_shortcode([dl]). I just can’t make it work with spoiler tag.
And also i want to use more tag in my plugin, but it not working any way I’m trying. Hope for your help