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

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 physics") OR ((((("quantum physical") OR ("quantum critical"))) OR ("quantum chemical")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"quantum physics\") or (((((\"quantum physical\") OR (\"quantum critical\"))) or (\"quantum chemical\"))))".
• Removing quotes may allow a broader search: (( quantum physics ) or ((((( quantum physical ) OR ( quantum critical ))) or ( quantum chemical )))).
• Adding a wildcard symbol may retrieve word variants: (("quantum physics") or ((((("quantum physical") OR ("quantum critical"))) or ("quantum chemical"))))*.