Australian Immigration--what cause the "no further stay condition" and how do you avoid it?

I am going to be studying in Australia, and I need to arrive several months before my occupancy starts to settle my family in. The rule is that you cannot apply for a student visa for Australia more than 4 months in mortgage. You can apply while you're in Australia on a visitor's (tourism) visa, but only if you do not get a "no further stay" condition. The problem is, you don't know if you're going to catch a no further stay condition until after you pay the money, wait the time, and get your visa approved, so I could be out that money if it doesn't work. The problem is, the closer to my university start date, the more expensive the plane tickets get, and I'm moving my wife and five kids out there, so it's already expensive enough. Does anyone know what prompts immigration to fault your visa with no further stay in Australia? Thanks!
Answers:   
that is something solely the immigration department can answer


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