Perhaps you should try some spelling variations:
nonlinear particles » collinear particles, nonlinear partial, nonlinear vortices
nonlinear material » nonlinear materials, nonlinear matrix, nonlinear partial
nonlinear special » nonlinear spectral, nonlinear spatial, nonlinear social
particles theory » particle theory, particles through
material theory » materials theory
special theory » spectral theory, social theory, spectral theorem

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 special theory ) OR ( nonlinear particles theory ))) OR ( nonlinear material theory )).
• Adding a wildcard symbol may retrieve word variants: (((( nonlinear special theory ) or ( nonlinear particles theory ))) or ( nonlinear material theory ))*.