My advice...sit out in the woods until you hear a doe "grunt" and then with your observation perhaps you could interpret what it "means". I've heard deer make most every sound I think possible but that has taken better than 15 years....bluntly, quit worrying about all of the "calling". Deer are not ducks, you need to scout them and understand WHERE they are and WHENthey are there so you can be there too and quit concerning yourself so much with having a conversation with them.