Perhaps you should try some spelling variations:
nonlinear properties » nonlinear processes, nuclear properties, nonlinear operators
properties theory » properties other, property theory, properties thermal
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 properties theory ) OR ( nonlinear partial theory )).
• Adding a wildcard symbol may retrieve word variants: (( nonlinear properties theory ) or ( nonlinear partial theory ))*.