Reference

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.  For example, searching for "help" will match both "help" and "Help". 

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.  Thus, "bread" matches "bread", "breads", "breaded", "breading", and "breadth".  (If you check the "only match whole words" checkbox, then the whole word must match your string--that is, "bread" will only match "bread".) 

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.  Notice that this is different from most web searches, where pages are chosen if the words appear anywhere on a page. 

The order of words in a phrase doesn't matter
If you enter more than one word, they will match a web page if the same words appear near one another in any order.  For example, "Mount Everest" will match "Mount Everest", "Everest Mountain", and "that awesome mountain, the great Everest". 

Search Type