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Toph's particular way to "see" makes her privy to other information about a person. She can feel heartbeats, bloodflow, that sort of thing. Anything the body does that makes a vibration. Because of this, she knows when you're lying. Unless, of course, you're the type of person who is so used to lying that there's absolutely no physical change at all. Or you're insane like Azula.

Aside from that, anyone familiar with different styles of kung fu will recognize that she uses Southern Praying Mantis Kung Fu in her Earthbending. She learned this style when she learned Earthbending from Badgermoles, who were the original Earthbenders. Normal Earthbenders use Hung Gar. If anyone wants to comment on that, it would be interesting.