Hopefully the Mods will let this post stay, but I understand if it needs to be removed.
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I am not technically the owner of the site I am referring to in this thread, but refer to it in the 1st person (as the owner) for ease of discussion.
In the interest of disclosure: I am a member of the Ownership LLC, co-founder of the site and hold a position in the company owning the site, but my views, ideas and opinions posted as TheMadScientist should in no way be considered the views of the company or companies owning the site I am referring to, any sites I work on, refer to or have even an indirect interest in. My posts are solely my personal views, opinions and ideas.
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That said, I have put the site I've referred to in this thread in my profile for those who have not seen the title changing or what can be highly negative effects.
The 2 word search phrase in question can be found by removing the word Address from the 3 word phrase in green text on the home page. (I prefer to not post it here, even in my profile, for what should be obvious ranking reasons.)
To see the difference the change makes on the SERPs page, search Google for the phrase and find the page, then search Bing (where the title is not changed) for the same phrase and the difference and reason for the drop in clicks due to the title change should be apparent.