I've checked the code and it looks like I forgot to include this feature from the term results, that's why it's not working.
The only way around this is to make modifications to one of the files.
You will have to open up the following file on your server: wp-content/plugins/ajax-search-pro/includes/search/search_terms.class.php and replace it's contents with this: http://pastebin.com/raw.php?i=Zq8AWuui
That should solve the problem.Best,
If you like my products, don't forget to rate them on codecanyon :)