I believe there is a difference between the main google search engine at google.com and the regional search engines who give you a choice under the search bar of searching the entire web or searching only for pages from that country.
I would assume that all sites should be in the main google database, but a different database or algorithm would be used when searching for pages only from a country like Australia.
This is why the Australian site shows up in the google.com search but the US hosted sites do not show up when searching for only pages from Australia.
It is also interesting to note that the adwords results are different when searching from a local engine, as this is one of the options in Adwords.
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