Isac Jacobsen Nordbø

Can someone help me to find Isac Jacobsen Nordbø who emigated 1843 - 1846 from either Moland, Telemark or Landvik Aust-Agder. With him was his wife and 3 children. I don't know there names. He maybe had two brothers, <<<<<<<<nicolai and Mathias, who lived in Nissedal, Telemark, who emigrated in 1850. They had also stayed in Landvik for some years. Any information is usefull.