How can I find where one word is close to another word?

As most people on this forum are likely aware, searching for a word is straight-forward enough. If I want to find occurrences of the word 'arc', I can type / arc , with spaces around the three letters, to find basic occurrences of the word (ignoring punctuation). But suppose I want to find where two words are close together, say, within ten words? Here's an example:

Now is the time for all good men to come to the aid of their country.

In this test, I want to find all occurrences where the word 'aid' is within ten words of the word 'country'. How can I do that in Vim?

This is cross-posted on Vi and Vim Beta.

Thanks!

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