It's collocation. If you leave your home, you should use that word. It's the somewhat the same if you're back to your place. For ex: Get out of my house = Ra khỏi nhà tôi (request) Come into my house = Vào nhà tôi (request)

khỏi is nonsense, it needs to come after "ra". " ra khỏi" means leave where you are staying or standing. In vietnamese, some words can't stand along. it needs go with another one in order to make sense. EX: "mệt quá" = too tired; if you just say "quá" everyone can't get it. you can't say "ra nhà:" it makes no sense but ones will understand if you say "ra khỏi nhà" = leave home.

""khỏi" in sentence is meaning :"go out the home", informal, "khỏi" is meaning hết một tình trạng nào đó. For example : Tôi đã khỏi bệnh.