I'm in the UK. I get the UK site as the first hit. I don't get the .com.au sites, even if I search for [kogan.com.au]

I've seen a few threads on HN where someone claims that Google has removed them from the search results (often after a Google update) and it turns out that the site had a weird set of errors. (mix ups about http and https, and about including or not the www.)