Ultimately, you'll pick a handful of sites by trial and error that turn up the kind of results you're looking for. To help you identify the sites that suit you best, try a site like SavvySearch that feeds your query to multiple search engines so you can see which search engine gives you the best results. No two search engines work quite the same. Sure, many of them use Boolean-style techniques, but they don't all use the same syntax. While some search engines are case sensitive by default, others allow you to choose whether or not a search will be case sensitive.
Many engines ignore words of three or fewer letters.
And some search only indexes of keywords, while others search the complete text of pages. In short, before you go throwing words out into cyberspace, read the instructions. In the next few months, we'll be adding some concise instructions to this page for forming searches in a variety of different engines. In the meantime, click on the Help button at each site you use. If you're interested in finding out about old-timey Web browsers, don't use the words Mosaic or Cello or you'll be bogged down with sites about stone inlay art and stringed instruments.