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Trackable all the target

I have a problem

I have cards with alphabet letters and place them side by side. example:B, O, L, A .. you put together to form the word BOLA which in English means BALL.

Is a  puzzle, you know?

My target is that, when the word is complete, the object ball appears in RA.

my target: http://i60.tinypic.com/2vn12f6.jpg

I wanted to appear only when the word was complete, but has appeared when compiling B, O or BOL and it would appear that when it's all letters has been together.

Can anyone help me? I'm new to Vuforia and made through simple tutorials with target that I found on the site.

PS: I'm Brazilian, is because that word BOLA = BALL