Only Chris knows for sure, but I'm betting it can't be done. I have trouble with Boolean searches on the board as well. For anything beyond an easy search, Tim has the right answer. Go to
www.google.com, click on Advanced Search, put in the words or phrases that you want to search for, enter "trailmanorowners.com" in the Site or Domain box, and hit the button. This is a much better search engine.
There is a slightly different way to use Google if you want to search for a post by a particular person. Go to
www.groups.google.com. Warning - TMO is not a "group", so don't fill in any of the blanks that ask about groups. But fill in the words/phrases that you want to search for, fill in trailmanorowners.com as the Site or Domain, and way down at the bottom fill in the author's name.
Bill