Sam, You can't buy them all.
When you meet with a horse which is trying to communicate with you, then try to listen. Try using your fingers to talk back. Get close so they can smell your breath and watch your face but take care they don't stand on your feet.
You would be a genius to break the code, but to suspect that a horse might try to talk to a sympathetic human is not so ridiculous. After all my dog communicates his needs to me quite easily - he has trained me well to watch and guess what he wants.
I talk to my horse and from time to time, I even believe she might be talking back but of course she doesn't have the vocal chords. She loves to stand by me, head by head when I am talking to another person - as though she is part of the conversation.
Ask yourself how much of human communication is by look, by touch, by 'sensitivity' which includes the emotions of fear, empathy and sympathy.
I don't speak Chinese but I have not tried to learn - it is too complicated.
Some riders don't talk 'horse' because they have not tried to learn.
PS My mare came off Danilon yesterday for the first time in several weeks She was probably pain free of the ulcers for the first time in probably years. I gave her a few treats and then she licked my hand for several minutes. I kidded myself she was saying thank you for recognising the pain in her and finding a remedy. Maybe she was ....???