Perhaps you should try some spelling variations:
"quantum classical" » "quantum chemical"
"quantum critical" » "quantum chemical", "quantum optical"
"quantum physics" » "quantum physical"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quantum critical") OR ("quantum classical"))) OR ("quantum physics")).
• Removing quotes may allow a broader search: (((( quantum critical ) or ( quantum classical ))) or ( quantum physics )).
• Adding a wildcard symbol may retrieve word variants: (((("quantum critical") or ("quantum classical"))) or ("quantum physics"))*.