Hi!
The suggested search phrases field is for something else entirely: https://goo.gl/2n2bNN
Basically with that option you can control those words for each single post individually.
If you want to add additional words, I suggest creating a custom field. For example you can make a custom field called search_keywords then enter the keywords separated by space instead of comma: https://i.imgur.com/rOlRqSu.png
Then, on the General Options -> Sources panel you can select this custom field as a source as well: https://i.imgur.com/AVO1UjI.png
That should do the trick 🙂
Best,Ernest Marcinko
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