on Just Publishing Advice:
An Amazon keyword tool is a must for all self-publishing authors.
Search keywords on Amazon help customers find your book when they use search terms to find a new book to read.
But discovering relevant keywords for your book is not a quick and easy process. To uncover what search queries Amazon customers use, you need to use a tool to find keyword suggestions.
A book or ebook is like any other Amazon product. The way to succeed is by optimizing your product with backend keywords.
Chris The Story Reading Ape's Blog 