You are talking about the "six books" of word formation. China's "Chinese characters", including the later Japanese-made "Harmony", were originally created according to China's "Six Books", but then China and Japan successively launched the "Chinese Character Simplification Movement", among which China's simplification was the most serious, and some Chinese characters have lost the structure of the past six books, so not all modern simplified characters can use the "Six Books".
However, if we analyze the corresponding traditional Chinese characters, we can still see that the word formation at that time can be traced back.