missing relatives

I am in search of my grandmothers aunt. She left Bergen on May 15 1885. I can find nothing else about her after that point. At that time my grandmothers dad and uncle were living in Seely township in Faribault county Minnesota. These would be her brothers. Her name was Synneve Johnsdatter Hjelle. I am also looking for information about my grandfather. His name was Einar Eriksen (Erickson). He was born in Oslo Norway in 1879. I believe he left Norway in 1902. The only one who fits the bill left Oslo in 1903 however. He appears in the 1910 census for Grand Forks North Dakota. He is named Aleck Erickson there. My dad remebers him being referred to as Einar sometimes and Aleck sometimes. It also says in there that he was natualized in 1902. I can't make anyone else fit from the digital archives of Norway. The smaller communities seemed to have a village book or possibly Church records. Is there any such documentation available for Oslo? If anyone has any information at all or even suggestions I would glad to listen.