Olsen's to Norsewood on the Hovding in 1872

I'm trying to find any information about the Olsen's that travelled to NZ on the hovding in 1872. Hans and Lisa Anna (she was also know just as Anna). They came with 3 children Christian, carl and Hannah. Hans was born in 1835 in Trogstad, Norway and Lisa in 1832 in Hannacha Varmland, Sweden (we think). How do i find information about them before the hovding trip to NZ. These were my great great grand parents, they died in 1921 and 1925 in Norsewood and are both buried in Norsewood as are most of there children. I would love to hear from anyone who thinks they can help. Thanks Sarah