Pretty much, you can't - or at least not without the same kind of effort that Google put into their search engine.
Natural language comparison isn't at all simple! Compare these two statements:
A cat is a domestic animal with four legs,two eyes that catches mice and small birds
A member of the genus Felis, Felis Catus (or the domestic cat) is a binocular quadruped predator that preys on small mammals, birds, fish, and marsupials (where available).
They both say the same thing, they are both correct (within reason - our cat will catch anything and eat it).
But how do you compare them and say "that is right" or "that is wrong"? Heck, most developers can't even get that right with math questions!
Sorry, that's not correct[
^]
To be honest, this isn't a project that I would even consider doing myself, and I've a fair amount of experience. For a relative beginner? Don't go there - it will take far, far too much of your time!
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