Special Search Engine for PDF and Ms Office files

We usually using “filetype syntax” on google to find PDF files or Ms Offile files on internet. To make easier to find PDF, Doc, Xls and PPT files on internet we can use special search engine for these files.  I found two search engine on internet specialist to search PDF, Doc, Xls and PPT files or ebook on internet that is docjax and pdf-search-engine

Complete articles : tricks-collections.com

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