Every search engine returns different results. Plus, there are many search engines that focus on specific niches: games, blogs, books, forums, etc. The more comfortable you are with a good variety of search engines, the more successful your searches are going to be.
It’s easy to skim the surface of your favorite search engine and only use the most prominent features; however, most search engines have a wide variety of advanced search options, tools, and services that are only available to those dedicated searchers that take the time to search ’em out. All of these options are for your benefit – and can help make your searches more productive.
In addition, if you’re just starting out learning how to search the Web, it’s easy to be overwhelmed with just the sheer amount of information that is available to you, especially if you’re searching for something very specific. Don’t give up! Keep trying, and don’t be afraid to try new search engines, new Web search phrase combinations, new Web search techniques, etc.