Results only include pages that contain all of the query words.
Use quotes around words that must occur adjacently, as a phrase, e.g., "Ulysse Nardin".
Punctuation between words also triggers phrase matching. So searching for http://www.ulysse-nardin.com/ is the same as searching for "http www ulysse-nardin com".
Searches are not case-sensitive, so searching for UlYssE is the same as searching for uLySse.
You can prohibit a term from resulting pages by putting a minus before it, e.g., searching for limited -set will find pages that discuss limited, but don't use the word "set".