A more strict phrase feature is currently not exposed.
Then I guess I will have to continue to use Google to search for exact phrases.
Otherwise if I use the B4x forum search I get far too many results returned and the results with the exact phrase aren't always ranked to the top of the list. I think it may be because the number of search words found in the post will rank the result higher than an exact phrase match if the exact phrase appears only once in the post.