Well, once you have scanned 0 value, find a friend and make a party. Now in CE you can see near of FirstScan button a "Next Scan" button. This "Next Scan", compare the las search that have you maked before.
The steps: "First Scan" with 0 in "value", Exact Value in "Scan Type" and 4 bytes in "Value Type". When CE has maked the scan, go to Cabal an make a party with a friend.
Next i CE change 2 in "value" and push in "Next Scan" button. CE will compare all memory regions with 0 value that has been found before, with the new value 2.
When CE has finished, break the party and now search 0 with "Next Scan".
Do this until you have found few values, or only one.