How the letters should be transformed:
ø -> o ( not oe )
æ -> a ( not ae )
å -> a ( not aa )

This is not official rule, but is has become a standard.
http://www.sprakrad.no/templates/Page.aspx?id=634#ae ( Page is in norwegian )

sprakrad.no ( Språkrådet ) is not written spraakraad.no
lanekassen.no ( Lånekassen ) is not written laanekassen.no