The query intext:term restricts results to documents containing term in the text. For instance, [ Security Focus intext:Network ] will return documents that mention the word "Network" in the text, and mention the names "Security" and "Focus" anywhere in the document (text or not).
Note: There must be no space between the intext: and the following word.
Putting intext: in front of every word in your query is equivalent to putting allintext: at the front of your query, e.g., [ intext:security intext:focus ] is the same as [ allintext: security focus ].