Perhaps you should try some spelling variations:
"nonlinear particles theory" » "collinear particles theory", "nonlinear partial theory", "nonlinear vortices theory", "nonlinear partials theory", "collinear particless theory", "linear particles theory", "nonlinear particles through"
"nonlinear particle theory" » "nonlinear partial theory", "collinear particles theory", "linear particle theory"
"nonlinear partials theory" » "nonlinear partial theory", "nonlinear spatial theory", "nonlinear parts theory"
"nonlinear material theory" » "nonlinear materials theory", "nonlinear matrix theory", "nonlinear partial theory"

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: (((("nonlinear particle theory") OR ((("nonlinear particles theory") OR ("nonlinear partials theory"))))) OR ("nonlinear material theory")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nonlinear particle theory\") or (((\"nonlinear particles theory\") OR (\"nonlinear partials theory\"))))) or (\"nonlinear material theory\"))".
• Removing quotes may allow a broader search: (((( nonlinear particle theory ) or ((( nonlinear particles theory ) OR ( nonlinear partials theory ))))) or ( nonlinear material theory )).
• Adding a wildcard symbol may retrieve word variants: (((("nonlinear particle theory") or ((("nonlinear particles theory") OR ("nonlinear partials theory"))))) or ("nonlinear material theory"))*.