DuckDuckGo is becoming a popular alternative to conducting searches on Google.com. The reason for that popularity is a reflection of DuckDuckGo's claim to not track search habits of individual users. While it is a good search engine, it still has a way to go to compete head-to-head with Google's advanced search options. That said, there are some advanced search refinement tools available in DuckDuckGo.
In this short video I provide a demonstration of how to refine search results on DuckDuckGo. The video includes a demonstration of how to use a couple of "hidden" options that aren't obvious to most students. Those options are refining search results according to top-level domain and refining search results according to file type.
