What is the probability that we get more than $\frac{n}{2} + 2\sqrt{nln(n)}$ heads?

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Toss $n$ coins. What is the probability that we get more than $\frac{n}{2} + 2\sqrt{n[\ln(n)]}$ heads?

How do I apply Chernoff Bounds to this?

I really need help understanding Chernoff Bounds.