Just as a potential idea, consider implementing a bunch of smart groups targeting your potential “areas of interest” (see/research more about “para” e.g. here or elsewhere)
This is how it might look (indeed depending on your interests and topics):
If all your data is OCRed, DT is really great in finding all these insights.
Another idea is to combine search terms e.g. - the more specific they are, the greater results you will get
If you use tags, you can use the Tags view.
Last but not least, you can use the cool “words Cloud” view in the inspector to get inspiration - just select a folder/group to see which words are being picked up by the software.
This is really fantastic to search for potential connections
