Perhaps you should try some spelling variations:
"nonlinear physical society" » "nonlinear physics society", "nonlinear chemical society", "nonlinear partial society", "nonlinear medical society"
"nonlinear optical society" » "nonlinear optics society", "nonlinear political society", "nonlinear medical society"

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: "((\"nonlinear physical society\") OR (\"nonlinear optical society\"))".
• Removing quotes may allow a broader search: (( nonlinear physical society ) OR ( nonlinear optical society )).
• Adding a wildcard symbol may retrieve word variants: (("nonlinear physical society") OR ("nonlinear optical society"))*.