I'd prefer the results to show the exact match first, then any close matches that contain the searched username letters at the start, then any remaining results that contain the matched username letters within.
As an example, say I have a user named "Ohn". If I want to navigate to his Edit page in the AdminCP, I type in Ohn. This currently brings up as slew of Johns and Johnnys with a variety of additional names, numbers, and characters appended. You might have to go through several pages of Johns before you get to Ohn.
So in the example, if I type in Ohn, I'd like to see Ohn shown first in the results, followed by Ohn2 and Ohnny, then the multitudes of Johns and Johnnys.