search in inventory for an item that is there does not work

In the Chalmers environment (ping @pwanninger for credentials) the search for "Hamilton-Jacobi equation" brings up no results. Searching just Hamilton does bring up a list of items from which you can select the item. See attached screenshots

Conversely, in snapshot stable, you get a result by type bridget jones but none when you type bridget jones's baby.

When I search adding more words, I expect to get a more specific result.
Instead, more words often makes the search fail.