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

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 nonlinear physical") OR ("article and nuclear physical"))*.
• Removing quotes may allow a broader search: (( particle and nonlinear physical ) or ( article and nuclear physical ))*.