There are many tools out there that help with Amazon SEO, and one of the tools I have found most useful is Amalyze Chrome Extension. It has helped me to gather relevant long tail keywords for Amazon Sponsored Ads.
It is a free tool, and once you have installed it on your Chrome Browser simply enter the relevant keywords and it will generate a list of relevant and searched for long tail keywords.
“Our Keyword AMALYZER returns the keyword combinations which are the most common ones related to the given keyword. Also the “Keyword Amalyzer” tells you, e.g. which color or size is important for the customer regarding the product searched.”
Example 1 – In this screenshot, you will see a list of long tail keywords closely related to the word I researched. This list of keywords is used to trial on your paid campaigns.
Example 2 – In this screenshot, you will see a list of keywords that use the exact word entered and displays phrase match keywords. This list has fewer variations to the above example and so is much more targeted.