I find that when I search for the term "one" (no quote marks) it finds not only occurrences of the the word "one" but also "on". It appears to be stemming, but incorrectly. I was looking for every verse that contains the word "one" and the word "God." The error occurs for me using both Bible Search and Bible Speed Search.
Using the search term nostem(one) seems to get the proper result, but you shouldn't need to add that as "on" is not a stem of the word "one."
Can anyone else verify this problem?