How to search a word file (Doc and Docx) by a text content in OS X

If Spotlight does not index word file content in OS X as too many Mac users have complained, how to search a word file (.Doc or Docx) via suggested keyword such a text content in Mac OS X Yosemite and El Capitan? Look at our following tip.

Spotlight: search for office word files (docx, doc) in OS X Yosemite

Normally, Mac users face a problem related to using Spotlight to search for document files after upgrading to Mac OS X 10.10 – Yosemite. Look at our tip with Spotlight to search for word files such as file.docx and file.doc in Mac OS X.