They didn't target the actual crash site, they targeted the ice flows downhill from the plane. Since it was a big thaw when they were there, they found a lot of recently melted stuff, including body parts which were rumored to be absent. They found magnetic tape almost certainty from the flight recorder, but due to shaky international relations and bureaucracy it's just sitting around without being analyzed.
Despite this, from their research its become increasingly obvious what happened. Bad nav, bad nav, bad weather, bad ground crew, language barrier, bad practices, and bad company policy caused the plane to come down.