even better, just type dukgo.com/(search terms, no parens needed) and it takes you straight to the search page you want. So far it hasn't failed, no matter what punctuation I've used (Chrome)
If you are using Firefox, you can modify the variable keyword.URL in about:config to point to DDG instead of Google. This also enables "bang syntax" in the firefox address bar.
For example, I can type "!cpp string::length" into the address box and be taken right to the reference page(s)