A new free UserScript for your browser, Super-phrase – automatic “phrase search” on DuckDuckGo. It cost me £10 in the end, as I had to hire on Fiverr to get the Regex fixed up as well as the initial script made, but it was worth it. You’re welcome.
While you’re at it you may also want this for your uBlock Origin blocklist…
! Block DuckDuckGo mainpage autocomplete
… this turns off the flickery and nearly-always-wrong auto-complete drop-down.