I have an idea for the find (ctrl + F) function. I propose there be a double find option to search for multiple phrases from different paragraphs. This feature would be useful for scientists and scholars who need to search a pdf for one phrase as it relates to another. For example, if I need to search for "enzyme replacement therapy" but I want to find where it relates to "Endocytosis" as opposed to "Passive diffusion" I can find it easily. I am sure there are countless other use-cases.