Two free alternatives that you could try for rendering a pdf are
itextsharp or pdfsharp.

Here are some links to the renderers listed above
PDFsharp & MigraDoc - Home
iTextSharp - Tutorial
iTextSharp | Get iTextSharp at SourceForge.net

As I have not had much to do with text search and pdf I do not know how these will fair, they are worth checking out though.

Regards

ScottyB