I have great luck not actually in the thick stuff but on the edges of it where two kinds of terrain come together, say a thick area with honey suckle, brushy, alot of undergroath, where it meets with, say more open woods with bigger more mature trees, look for pinchpoints, or mabey blowdowns that sway deer to travel a certain way. look for places where they might be comming into the thick stuff or leaving it to bed or feed.
Dan