Dustysags,
If you've gone to the trouble of finding trigger words, ask questions centered around those trigger words.
For instance, when PRing a book on organization skills, two of my trigger words were: organization, list making (OK, sometimes I pick phrases).
The probing questions I came up from those were:
1. How do I organize my workspace?
2. How do I succeed with lists?
Other probing questions I came up with were:
3. How do I prioritize my day?
4. How do I focus and avoid distraction?
5. How do I successfully plan goals that I can live with and accomplish consistently?
Not all questions were driven by the trigger words. Some were also based on headings I noticed while previewing. Use anything that generates a question within you. Anything that gets your curiosity going. Admittedly, that is a little tougher with text books, but you can still do it. Think of ways you could apply this material to your life. Perhaps you could prime the pump by starting out with satirical questions about the material.