Cannot search for identifier containing underscores

... well I can search for it but the results aren't any good.

I want to search for bugs mentioning the variable BZR_REMOTE_PATH.

https://bugs.launchpad.net/bzr/+bugs?field.searchtext=BZR_REMOTE_PATH&orderby=-importance&search=Search&field.status%3Alist=Unconfirmed&field.status%3Alist=Confirmed&field.status%3Alist=In+Progress&field.status%3Alist=Needs+Info&field.status%3Alist=Fix+Committed&field.assignee=&field.bug_reporter=&field.omit_dupes=on&field.has_patch=&field.has_no_package=

It looks like this returns all bugs matching (bzr, remote, path), which is not so bad in this specific case but is bad if the words are individually common. I would rather _ was treated as a word component not a separator, or at least that by quoting the word I could get that behaviour...

This is like bug 56244 but not the same.