Yes . You just need to make sure you install and publish the Documents Seller Search plugin (plug_search_dms.zip in the package) and the documents will be displayed in search result when you use Joomla Search. If you want, please submit a support ticket sending me administrator and FTP account of your site so that I can check and fix it for you .
I have downloaded the Document Seller search plug in and that works fine but this search only finds documents contained within the Document Seller system. I won't find other pages on the website.
Equally if I use the generic search for Joomla, I only find other pages on the website and not any of the Document Seller Pages.
I am looking for a way to search BOTH the Document Seller documents and the other website pages.