Having trouble knowing what words to type in to search? Check out this tutorial on Choosing and Using Keywords.
When searching be sure to choose a few words that describe your topic and combine those keywords using AND and OR. Never type in a complete sentence, and avoid using natural language words like in, the, of, where, about, etc.
** small edit: the image below uses an older screenshot when we called the service "Everything". The Everything search is now called Discovery.