Akershus Parish or Farm

In documenting some records, I have found some records for children included in one of my ancestral families that do not have a record in the registers (Asker) that all the other events are found in - births, marriages, subsequent children and deaths. The source information used by the posters of these records are pretty sparse but in an effort to see if these records may be legitimate, I would like to know if any of the following names can be connected to a parish register for further review : Breuua or Brenna - I find no parish but perhaps a farm - if so what parish would it be in ? Isi, Vestre Baerum - a farm ? Vestre Baerum is together with Asker throughout the time I am reviewing but I find no record in the register for the date that the poster is claiming. Perhaps some other parish ? I tend to doubt these records as everything that happened to these people including parents and 5 children and the grandparents as well as most everything that happened to the children as they raised families is right there in Asker. I realize errors and oversights happen but it seems a stretch to have missed 3 children in the registers who happen to have outlier home information. Any insight is welcome.