This is much better because the sites will almost definitely be more relevant. Typing in lower case will produce a different, undesired result. Try experimenting a little bit. It will take a little practice, but you will learn quickly how to finds sites that you want. This will find results for cars AND buying, as well as cars AND selling.
Parentheses work the same as they do in regular mathematics.
This section should have cleared up a lot of questions that you may have had about search engines. For more information about search engines follow this link .