"physic" is not even mentioned in the description!
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Substring searching is not actually implemented, which is why "phys" doesn't return any results. I think what you're seeing with "physic" matching "physics" is actually stemming - it sees "physics" as a form of the word "physic" and matches both. You'll see similar results if you search "physical" for the same reason.
The search box searches proposals and questions on proposals. There is an example question on bicycles "What forces of physics make a bike stay upright?"
So that's why it's showing up.