Finding and using the right keywords for your ad campaign is essential. If your keywords do not relate to your book you are wasting your ad money, and your ACoS will be too high to earn money from your book sales.

I recommend about 50-100 keywords per campaign. From my own experience, you are better off with several small campaigns than one large one. You will receive a warning in the Keyword Optimizer when you use more than 100 keywords.

I have tested more than 10 different services to gather good keywords. What are good keywords? These are keywords that have lead to sales, which brings us to the main difference between the Google and the amazon search engine.

People use Google mostly to find information, however, they use amazon to buy products. That’s why using the Google Keyword suggestion tool is not very effective.

So far the best keyword tool is MerchantsWords. Basically, it’s a huge database of amazon keywords that are related to product sales. It’s as simple as entering a phrase and you will get all related keywords.

Their service costs $30 if you go only for the US market, which is the biggest. I was able to negotiate a great deal with MerchantsWords, and with this discount code, (not an affiliate link) you only pay $9 per month!

I highly recommend that you sign up for only a month and use that time to research your keywords and build several ad campaigns. Here is a list of suggestions:

  1. Find related author names
  2. Find related titles
  3. Find keywords that describe your genre

After you put these phrases into MerchantWords use the suggested lists and build your keyword list. Make sure you are using the Filter at the top and select Books from the categories. Use the estimated monthly search volume to filter out phrases below 1000 searches per month.

When you use broad keywords in your search you may end up with a very large list of keywords. You can then drill even deeper into the results by selecting one of the broad keywords and receive a new, more detailed and long tail keyword list. See the example below.