AdSense sensing, Google ignoring?

For several days I've had content-relevant Google AdSense ads displaying
on my web pages. But Google returns nothing for searches that match one
or another of my pages. I understand that when you submit a URL for
indexing there's no telling how long it will take before they get to it,
but the fact that the AdSense is working means that they've done it
already, so why are the ignoring it for searches?