Perhaps you should try some spelling variations:
"particle and nuclear physical" » "particle and nuclear physics", "particle and nonlinear physical", "particle and nuclear medical"
"particle and nuclear material" » "particle and nuclear materials", "particle and nuclear matrix", "particle and nuclear matter"

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: (("particle and nuclear physical") OR ((("particle and nuclear material") OR ("particle and nuclear medicine")))).
• Removing quotes may allow a broader search: (( particle and nuclear physical ) or ((( particle and nuclear material ) or ( particle and nuclear medicine )))).
• Adding a wildcard symbol may retrieve word variants: (("particle and nuclear physical") or ((("particle and nuclear material") or ("particle and nuclear medicine"))))*.