Perhaps you should try some spelling variations:
"particle and nuclear medical" » "particle and nuclear material"
"particle and nuclear physics" » "particle and nuclear physical"

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