You can't, unless you're a realtor. This is the stranglehold that these people still have on the market. It was the same way with stocks and travel years ago. In order to get the best pricing on flights you had to go to a travel agent in most cases. In order to get live quotes, you used to have to go to a stockbroker. That has changed.
It's only a matter of time before we get rid of real estate agents as well. I for one have absolutely had it with them. Every experience that I've had wit them has been negative, including the house I'm living in. Sure, they're fine if you're going to do a straight retail purchase, but one curve ball and these folks are totally sandbagged. Which begs the question, why in the world are we forced to deal with these people?
Anyway, end of rant. You must depend upon the search skills of someone else if you're to find a home. In order to get them to do that work, they will more than likely want to handcuff you with an exclusive agent agreement as well. Otherwise, if you're looking for short sales and foreclosures, you'll have to hope they include things in the description on Realtor.com or Trulia like "Buyer responsible for U&O" or "Home is being sold as-is". If you're really lucky, you might see "bank owned". However the more sleazy shops will hide all of that from public view, because they don't want foreclosure hunters. They want a straight buyer that they can move to a foreclosure home. That keeps the price higher. So that info, as I'm sure you know, is only available via the agent fields in trendmls, which you will only see if an agent sends it to you.
So your last resort is to search bank sites, homepath, hud, etc. If you have the cash, then local sheriff sales are public as well. Otherwise, hire your local cheesy real estate agent, endure their idiotic questions, moronic advice, and lousy work ethic. One thing to remember about these folks is if they REALLY knew what they were talking about when it comes to real estate, they'd be investors, not agents. So when they give you that "professional advice", nod and smile, and do your own homework.