Good day:
If you can work with phrases (and each phrase, it is treated as a keyword) and that is very good.
1. Set numerical value (high value) to:
General options -> Logic & Behavior:
Minimum word length: 22
2. I create phrases (each phrase in a keyword)
to. I select taxonomies to use (in this specific case: action, categories, city), I prepare plural and singular versions,
b. I add terms: in, of,
c. I combine the words,
3. The phrases created, I keep them in each property in:
Ajax Search Pro Settings:
Additional search tags for this post (space separated).
And everything works great.
Suggestion:
Consider, later, to create an option: that allows generating automatically the phrases (keywords) based on the taxonomies that the end user decides to use (Keyword Generator), to create the possible combinations and the result is automatically placed in:
Ajax Search Pro Settings:
Additional search tags for this post (space separated).
Best regards.