When I type in "public speaking" in the Kindle store it suggests:
"Public Speaking" followed by
"Public Speaking for Success"
I tried using the 'suggestions' for my original phrases, but didn't have much luck with my book showing up. At least my book now shows up when I type in the phrase, but I'm wondering if most people wouldn't just type in 'public speaking' and see which books come up. I've got 'public speaking' in all my phrases, but it didn't seem to help - but I suppose it could be worse, at least my book was on page 50 and not on page 297
Just as a test, I typed "Public speaking." The first book's category is:
#63 in Sales & Selling (Kindle Store)
#211 in Sales & Selling (Books)
#186 in Business Leadership (Kindle Store)
The second on the list:
#283 in Public Speaking Reference
#247 in Running Meetings & Presentations (Kindle Store)
#96 in Public Speaking & Speech Writing
Third on the list:
#1 in Public Speaking Reference
#6 in Running Meetings & Presentations (Kindle Store)
#1 in Public Speaking & Speech Writing
4th
#1 in Commercial Law
#1 in Language Experience Approach Education
#1 in Vocational Test Guides (Kindle Store)
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What I got from the article was that Amazon has a maximum allowed characters in each keyword, and will ignore the rest. Maybe you could combine some of the examples above like -
meetings sales public speaking education - instead of a full phrase? Just a thought. (I didn't count the characters.)