When you build a single-page web app with something like Backbone driving routes and managing browser history, the page load event is only going to happen once at the beginning of the session.
This can be accomplished with a simple call to
_gaq.push(['_trackPageview']) with an optional second argument for the URL path/fragment/route of your current page. To tell Google that a user just searched for Nicki Minaj on my music site, I'd just call
_gaq.push(['_trackPageview'], '/search/Nicki-Minaj') for example.
You can get fancy if you are using Backbone, and override the Backbone.history.loadURL function to do this for you: https://github.com/kendagriff/backbone.analytics.