I did a search on the words "htc sense" and only one article came up. I started entering a question with the words HTC and sense in the title and several article were suggested with both words in the title. Is there a problem with search?
As I noted in a comment, we do auto-convert search terms that match popular tags, into tags, if they are in the top (n) tags on a site.
This doesn't work so well for small sites though!
I added another sanity check so that we only do this auto-mapping when the # of questions in the tag is 200 or more.
So, this shouldn't be happening now.
Definitely something funny with search, I see no results searching for "google earth"
Even though there's a question with those words in that order in the title, a tag called google-earth, and I can remember seeing another couple of questions lately that reference Google Earth in the main question text.