I have just tried to type in an exact search using with the polytonic keyboard preference selected. I can enter characters and accents ok but I cannot get double quotes. In the polytonic they are entered as Shft-Command-" or Ctrl-Shift-" but nether of these renders in the search box - no character appears. In TextEdit the first fails but Ctrl-Shift-" works. Both key combinations work in Pages and I could not find a keyboard shortcut conflict. I also checked the Acc doc and I could not see a conflicting shortcut.
Is this a bug or am I missing something ?