It's tough to see deer tracks in southern Ontario because of the little rain we had. I have the same problem, can't see tracks or have to look real hard to find just one. On Sat. I went to check out a corn field that is still up and couldn't find any tracks, but know the deer feed in it, so I went to the river that goes along the corn field and found all kinds of tracks where they walk in the river along the sides and come up to feed. The river is so shallow now because of no rain that the deer use it as a trail.
Go into the corn field and see if you see any areas where the deer are feeding. They usually go in a bit to feed and you will see damaged corn stalks and this is where you might find some tracks.