Keep in mind that you're not only checking to see if enough people are searching for a particular word, you're also trying to determine how competitive that phrase is in terms of rankings.
一定要记住：你不仅仅要了解是否有很多人用这个词搜索，你还要了解关于这个词有多少站在竞争排名。
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One way is by using Overture's Search Suggestion Tool, which allows you to see how many people are searching the Overture site for any given word or phrase.
When searching for content in a file containing thousands of pages of documentation, you are likely to know much more than you can specify in just a word, phrase, or regular expression.