How to completely delete my iPhone's internet browsing history?

I have an iPhone 4, iOS 7.So I was using safari and I entered a website address into the search bar. Now, every time I type the first letter of it, that website comes into my "top hits". How do I get rid of this? I've tried deleting the history, but it doesn't work.

I know exactly why i wanna delete your history. XD

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