you are asking tor the sort of search the google spent millions of man-hours development - for free ? that's a tall order
try writing the logic of what tests you need to code e.g. find protein then find batter but quit if you find a full stop before you've found batter... repeat with the words flipped.
Two words within a "section". well you' have to figure out what marks the end of what you consider to be a section, then code a test for that.....
have fun.
you may have more success if you convert the book(s) back into an uncompressed format, like .txt then let windows index the folder & file contents (tick index contents) & then use windows search on the containing folder... that brings a lot of firepower to bear, assuming you use windows.
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