The query intitle:term restricts results to documents containing term in the title. For instance, [ Operating System intitle:help ] will return documents that mention the word "help" in their titles, and mention the words "Operating" and "System" anywhere in the document (title or not).

Note: There must be no space between the intitle: and the following word.

Putting intitle: in front of every word in your query is equivalent to putting allintitle: at the front of your query, e.g., [ intitle:google intitle:search ] is the same as [ allintitle: google search ].