DuckDuckGo supports search syntax you can use to fine-tune your queries.

Search operators:

Example	Result
cats dogs	Results about cats or dogs
"cats and dogs"	Results for exact term "cats and dogs"
cats -dogs	Fewer dogs in results
cats +dogs	More dogs in results
cats filetype:pdf	PDFs about cats. Supported file types: pdf, doc(x), xls(x), ppt(x), html
dogs site:example.com	Pages about dogs from example.com
cats -site:example.com	Pages about cats, excluding example.com
intitle:dogs	Page title includes the word "dogs"
inurl:cats	Page url includes the word "cats"

Search directly on other sites:

• Use \ to go to directly to the first search result. For example, \futurama
• Use ! to search other sites' search engines directly. Remember, though, because your search is actually taking place on that other site, you are subject to that site’s policies, including its data collection practices. For example, !a blink182 searches Amazon.com for blink182. There are thousands of sites covered!

Instant Answers:

• Add news to your searches to generate Instant Answer news results. For example, LeBron James news
• Add map to your search to generate Instant Answer map results. For example, Philadelphia map
• Find out more about Instant Answers!

Safe search:

• Add !safeon or !safeoff to the end of your search to turn on and off safe search for that search.