DuckDuckGo employee here - Be sure to use the 'feedback' button that you find on the search results page whenever you feel a search isn't up to standards.
Our team has been working hard at increasing relevancy, but the best changes come when users let us know what they need.
Since we don't filter bubble results (https://www.ted.com/talks/eli_pariser_beware_online_filter_b...) results certainly feel different when making the leap, and that takes an adjustment period for most people. But, if you actually feel you have examples where you can't find what you're looking for, then we want to know so we can provide you a seamless search experience as well!