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I see plenty of results for those keywords in Japanese on the Overture keyword suggestion tool [inventory.jp.overture.com]
It may be that no enough people using Overture JP search on the Australia alone, but rather phrases like "Holiday in Australia" or some such similar. I have noticed the same situation on Overture US where a search for, say, Widgets, will produce search counts for all sorts of widgets, blue, green, red, but not for widgets alone. This may be the same situation.
Have you garnered search counts for similar phrases from the other Overtures amd do you use them when creating content for the Japanese market?
Onya
Woz
Do you have comparable data from AdWords for the same keywords?
In December "Australia" was the top term I came across. I don't think in just one month that the Japanese public would have completely changed their way of searching.
If you look at say "Cairns" the root word alone is almost 10 times more popular than any combination with the root word.