I've had the same problem and I have Chrome. I found if you go back to a previous website and then return to TOTV, the search will work. So basically you have to be new on the site and it will work.
Another way is to go to google and type in any website you want to search followed by a colon and then the topic and you'll get a search of that site, and many times older replies that don't normally come up. I have my address bar is also google search, so it's very easy to search that way. example
talkofthevillages.com: landscapers
talkofthevillages.com: landscapers - Google Search