I have occasion to go back looking for images I downloaded but don't remember where I saved them (or, just as often, I forgot to designate the folder for the file and the browser saved it to the LAST place I saved to which has no relation to the image I downloaded). The trick is to search your browser history. Open the default browser, go to the upper right (usually three dots) browser control and from there open the history as a tab. You'll see all of the stuff you did every day (it's usually quite a surprise to me how many sites I've visited - making scrolling down through it almost impossible).

The top of the history page has a search bar and you can try the terms you used for the original search and when you hit "enter" it'll show you the possibilities, going back to when that browser started keeping records (a good reason to not delete your history).