In short, the runabout's sensors and computers aren't nearly powerful enough to scan each Bajoran on the planet, isolate their DNA, compare it with a DNA strand on file and then provide a location for a single individual.
Note that when the ship's sensor do find someone specific from orbit, it's invariably because they're an alien or because they're wearing something (an element or a piece of tech) that's wildly incongruous to the setting.
In Star Trek, when they do scan DNA it's always at close range, using a tricorder or internal sensors which are presumably vastly more powerful.
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