Kjonegaard or Kvamme

I am wondering if anyone can help me and give me advice on finding relatives in Norway. My Grandfather Endre Kjonegaard came to America in 1880 with three children. His wifes maiden name was Kvamme. They left the Kjonegaard farm to come to America. This was in the Voss area. Both of my Grandparents were baptised and confirmed in the Oppheim church. Any help would be appreciated. Ron Kjonegaard