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

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 physical") OR ((("quantum optical") OR ("quantum chemical")))).
• Removing quotes may allow a broader search: (( quantum physical ) or ((( quantum optical ) or ( quantum chemical )))).
• Adding a wildcard symbol may retrieve word variants: (("quantum physical") or ((("quantum optical") or ("quantum chemical"))))*.