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

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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