Hmmm. Never heard of that before. Not sure why they told you that.
The one problem I see would be that they are scans which are just images of text but probably contain no text to search for.
That is unless they have run OCR (Optical Character Recognition) on the scans to convert the images to text. Other than that, search won't work no matter what you do.
Yes i bet they just scanned the image like you said. how do i do the OCR
so that it will work?
You would need an application that has the ability to do OCR. Adobe Acrobat can do it or there are other companies that make dedicated OCR applications such as http://finereader.abbyy.com/.
If you don't have the need for all of the other features of Adobe Acrobat, FineReader will be a cheaper purchase.