Thinking Sphinx text search

Hi people I'm having a problem with one search that I'm making in one of my projects. I am new using Sphinx and the problem is when I make a search like = "ipad" it work perfect but when I put "ipa" the full text s开发者_如何学Pythonearch seems no to work the way I want cause I'm not receiving anything back.

my_variable = self.search searchTxt, :match_mode => :any, :sort_mode => :extended, :order => sortType, :page => page, :per_page => perPage

Am I doing something wrong with the search?

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I think there is some additional configuration necessary to search with wildcards, as explained in the documentation.