You would have to purchase DataBridge for the advanced search features. It allows advanced querybuilding based on multiple keywords. The only other solution would be to hand code something that would work for you. Perhaps splitting the keyword string by the space character and then building the SQL statement dynamically based on the returned array.
There are hundreds of lines associated with recordset filtering included in the rsobj.php file that DataBridge includes UI's to access. I'd suggest upgrading to DataBridge in order to easily take advantage of them. Either that or I could help in a 1 hour premier support ticket if you would rather go that route and hand code it for you.
Did this help? Tips are appreciated...
