Google does not have one of these tools but there are plenty of companies that claim they gather statistic and can give you the info if you pay them.

Google Adword have a Keyword tool that can help you along the way but it does not show overall what people are searching for.

The most used keyword tool on the internet today belong to overture, and you can see some magazine also use this tool when Britney Spears have made a fool of herself again.

Keyword tool

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