Perhaps you should try some spelling variations:
nonlinear particles » nonlinear vortices, nonlinear martingales, nuclear particles
collinear particles » collider particle, colloidal particles, colliding particles
nonlinear material » nonlinear materials, nonlinear matrix, nonlinear media
material theory » materials theory
partial theory » particle theory, spatial theory, particles 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 partial theory ) OR ( ((nonlinear particles) OR (collinear particles)) theory ))) OR ( nonlinear material theory )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( nonlinear partial theory ) or ( ((nonlinear particles) OR (collinear particles)) theory ))) or ( nonlinear material theory ))".
• Adding a wildcard symbol may retrieve word variants: (((( nonlinear partial theory ) or ( ((nonlinear particles) OR (collinear particles)) theory ))) or ( nonlinear material theory ))*.