A rabbits teeth continually grow and chewing on things keeps them worndown. You can never get a rabbit to not chew.
You need to do is give your bun alternative things to chew on. Youcan do this by bunny proofing your house, i.e plastic tubing split down the middle and put cords inside of them. Plastic wrapped around chair legs etc if the rabbit will have access to things like that. Get down on the floor and look at things like your bun will. Its like when people child proof their house, its best to get down on their level and look at the things that would be interesting to them or that they can get to.
Give your bun, untreated whicker balls (available online and at craft stores), cheap whicker paper plate holders, cardboard boxes, phone books like Sweetsassy suggested, toilet paper tubes stuffed wtih hay, plenty of hay, untreated doll straw hats (I get mine at Hobby Lobby or any craft store), hay/straw mats & houses available at pet stores.
My point being is a rabbit is always going to need to chew on something. If they don't they can develop Malaclusion, teeth overgrow, making it very difficult if not painful for the rabbit to be able to eat.You then have to trim the teethyourself or take the bun to thevet to get them trimmed regularly.