Seems like there is some issues with the -2 without a space in them. - 2 + 2 works fine while -2 + 2 does not. -2 +2 seems working though. Also, try to search

Seems like there is some issues with the -2 without a space in them. - 2 + 2 works fine while -2 + 2 does not. -2 +2 seems working though. Also, try to search "-2" to get no results.