Search in Communities tab

When we are using the Search feature in Communities tab, we expect to see only community names that match the search word. I searched for "automotive" and it returned three communities. The first one had "automotive" in the community name. The second one had "automated" in the community name and the third one did not have "auto" in the community name at all. Instead it had the word "automating" in the community description.
Please clarify if this is a bug in place in Communities Search feature.