I had a look at all of these scripts. As said, they can index all text and metatags in EXISTING pages. If you need such a search script, they are fine.

But, none of them, will perform a database search.

__________________
Navaldesign
Logger Lite: Low Cost, Customizable, multifeatured Login script
Instant Download Cart: a Powerfull, Customized, in site, DB driven, e-products Cart
DBTechnosystems.com Forms, Databases, Shopping Carts, Instant Download Carts, Loggin Systems and more....
Advanced BlueVoda Form Processor : No coding form processor! Just install and use! Now with built in CAPTCHA!