Wikipedia:Trivially more concise
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 | This page in a nutshell: If a potential article title contains a shorter potential title as a substring, then the shorter title is trivially more concise. The shorter title cannot possibly be any less common than the longer one. This is one consideration in deciding the best article title, but there are others. Nearly always (but not always), the shorter title will be preferred. |
In move discussions in particular, often a choice is to be made between two titles, one of which is a substring of the other.
More generally, the two titles may differ only in one phrase, with the phrase in one title being a substring of the corresponding phrase in the other.
If the shorter title is precise and unambiguous, then generally it will be preferred. But if not, then the longer title may well be the best choice, as a natural disambiguation (or perhaps even as a parenthetical or comma disambiguation, in the possible but unlikely case that the longer string is in common use outside of Wikipedia and its format coincides with one of Wikipedia's standard disambiguation formats).
Evidence of English usage needs to be carefully interpreted. In the simple case that one title is a substring of the other, a simple search on the shorter title should of course return all hits for the longer title too. So if you get more hits for the longer title, there is something wrong. But are all hits for the longer title valid hits for the shorter one too? Probably! If the shorter title is unambiguous, then someone searching (whether by search engine or IEHEYEBALL or a bit of both) will likely recognise the shorter title too.