At least they're not running away, so that's a good start. I would get a chair (or sit on the ground) and just sit down in the run with them and let them get used to your presence. Move slowly, talk softly. You can try bribing them with treats, but they may not be willing to take them from your hands, so if that's the case just toss them on the ground nearby.
Many chickens don't like being touched so don't take that as a sign that they aren't tame or don't like you. Mine tolerate it but don't enjoy it.