Suprised no one has mentioned google scholar, the solution already exists. Not to mention google by itself is already a pretty great research tool if you know w

Suprised no one has mentioned google scholar, the solution already exists. Not to mention google by itself is already a pretty great research tool if you know what you're looking for. You can even search by file type e.g. "cure for cancer filetype: pdf" https://scholar.google.com/ https://scholar.google.com/