iPhone Multi-PDF search app

I'm looking for an iPhone app that allows me to search a term in more PDF file.
Do anyone know an app like this?

All apps that I have allow me to search a term in 1 PDF file at a time. So, for example, if I have 6 PDF and I don't know in which PDF file the term is contented, I have to do more search to find it in one of those 6 file.

So you need a PDF file reader that handles its own library, in other words. Doesn't GoodReader do this?