Need help with stem searching in DA

I am having trouble figuring out the “stem” searching in DA. From the Help file:

~term1: Contains all words that begin or end with term1 (words containing term1 as a part of the word; depends on the queried search engine)

When I tried queries such as:

~steve NEAR/2 Miller

I assumed I would get reuslts including Steve Miller, Steven Miller, and Steven John Miller but from the search logs, it appears that the only thing being searched is the term Steve Miller. Am I missing something here?

The ~ operator tells DEVONagent to accept substrings but DEVONagent doesn’t stem words. Therefore this operator is useful to scan known sites or useful for secondary queries.