The case of letters doesn't matter.
All searches are case insensitive.
This means you don't have to know whether a word is capitalized or not, or whether it is a title in all caps. Each word is treated as a prefix. A word on a Web page will match your search string if it begins with the same letters. Words in a phrase must be near one another. When you enter more than one word to search for, Web pages will be selected only if all the words you enter appear close to one another, typically in the same sentence or paragraph.