Finding Passengers and Documents of Family

Trying to find when my family traveled from Norway to the United States and see if I can find any documentation. I have found a lot of them on FamilySearch however with all the documents I have found I am not 100% on the names since they changed several times. Searched the Ellis Island and there is nothing to be found. Family originated in Hafslo, Sogn og Fjordane, Norway and the names are supposedly or close to, Lasse Nilsen (1816-1905), his wife Anna Sophie Randulff Franz (1809-1865), their son Nils Lassesen (1846-1922) and his wife Christi Olsdatter (1850-1934) and supposedly her parents Ole Iverson (1818 - unknown) and Kjersti Olsdatter (1821 - unknown). Thank you so much to any one that can help me find anything. :)