I'm sure this sounds strange, but the best way to search for a term on this website is to use Google...
Example 1: to search for "sponsorship"
go to: www.google.com.au
in the search box type: sponsorship site:www.aacasa.org.au
Example 2: to search for "sponsor a child"
go to: www.google.com.au
in the search box type: sponsor a child site:www.aacasa.org.au
Example 3: to search for "older child"
go to: www.google.com.au
in the search box type: older child site:www.aacasa.org.au
Example 4: to search for "older children"
go to: www.google.com.au
in the search box type: older children site:www.aacasa.org.au
Each of the above examples will give numerous results for webpages on the AACASA website.
If you cannot find what you are searching for...
First, Check your spelling
Then, Try different ways of writing the idea/word, e.g. try each of these... "sponsor" and "sponsorship" and "sponsored"