Here are some search suggestions (with links) for finding Australian content.
Add this search string into the title field of an advanced search in MultiSearch (link to search below):
Australia* OR NSW OR South Australia OR Victoria OR Northern Territory OR Queensland OR New South Wales OR NSW OR Canberra OR Tasmania
This will include any article with 'Australia', 'Australian', or an Australian state or territory in the title.
Here is a link to this search in MultiSearch. Add additional search terms to match your topic of interest.
Here is a link to this search in Ebscohost. Add additional search terms to match your topic of interest.
.