If your Search Engine crawl is not returning any "Content" results from a Full Crawl, i.e. pdf, docx files are not being returned then you probably need to register the mssph.dll file. Note that PDF content searching will require Adobe iFilter.

Start-->Run

regsvr32 "C:\Program Files\Common Files\Microsoft Shared\web server extensions\14\BIN\mssph.dll"

Try Full crawl and it should work.