Click the little '+' in the bottom right hand corner of the page and tell them that their website is worthless for booking award travel. Explain exactly why you couldn't accomplish what you wanted to today.

A more practical suggestion would be to ensure that you search by "schedule" not by "price." And make sure that all the boxes above the flight list are checked: 'Nonstop", "1-Stop" and "Multi-Stop". Sometimes there will be nonstop flights available but for some unknown reason they won't be displayed unless you take that additional action.

Finally, you can sometimes get better results by entering flight segments individually as part of a multi-city itinerary. You might even want to go to nwa.com or continental.com and search for award tickets on their websites. Look for the itineraries on DL flights then come back to delta.bomb and enter each leg separately.

Good luck, you will need it. And a lot of patience.