In Relativity when you run a dtSearch noise words are treated in effect as blank placeholders. If you search for a phrase that has any one noise word you can replace it with another noise word (regardless of the number of characters in the noise word) and get the same results. So if any of dozens of noise words are in the same position in the string, you'll be taken to the same phrases in the results.
In this example we run a dtSearch for the phrase, "touch base with John Nowlan"
. . . and we're taken to a document where the string is highlighted in the viewer:
. . . if we alter this string with a different noise word:
. . . the same results come up but the strings are not highlighted.