Suggester doesn't suggest

I'm using a phrase suggester to implement "did you mean" feature.
For text "civenchy", it will suggest "givenchy". But for text "chivenchy" it doesn't return any suggestion.
Note that both "civenchy" and "chivenchy" don't exist in the documents. So I think this may be related to string distance algo? Is there a way to fix or debug it?

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