If you are looking for free guide manuals, searching in Google is not a great option as there are thousands of unrelated information in the world wide web.

Thanks to a search engine called The Guide DB, we finally get to search and download free pdf format guide among its 47,700,000 free guides in the database, where it is a great online resource to download great guides in PDF format for almost anything such as manual guides, product information guides, user guides, tutorial guides, etc.

The search result page has a clean search engine like interface, showing related search for you to narrow down your search results, as shown below.