Have you tried just letting them go into the coop themselves? If they've been living in it since you got them, they know that this is home and should go in on their own. Could be they're hiding in the bushes and running away because they're feeling threatened by you chasing them. An easier way would be to use a can or bucket (preferably the same item every time), but some treats in it - something that will make a sound when you shake it - and train your chickens that way. Go out with the can, shake it, call them if you wish ("Here, chick, chick!) and shake a little of the treat on the ground. Soon they'll come running when they see the can or hear the call. Lead them into the coop that way, always rewarding them for coming in. At least I've heard that works, My chickens free range and put themselves in at night so it's not something I've ever tried.