Trouble using incidents.search_thread to match multiple terms

Content

Hi,

I'm trying to set up a report to locate incidents where certain phrases have been used. I have several phrases I'd eventually be able to locate, but the example I'm working with is where a customer has discussed a permanent closure of their account. This should be simplest one but I've spent hours on it with no success

I added the incidents.search_thread field to an existing report and set it to complex expression. I thought perm*clos as the search term should match all the following:

permanently closed, permanent closure, permenant