Perhaps you should try some spelling variations:
"article and nonlinear physical" » "article and nonlinear physics", "article and nonlinear chemical", "article and nonlinear optical"
"particle and nuclear physical" » "particle and nuclear physics", "particle and nuclear medical", "particle and nuclear optical"

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