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

Try widening your search to All Fields.

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