Perhaps you should try some spelling variations:
integration nonlinear » interaction nonlinear, interactions nonlinear, integration linear
nonlinear surface » nonlinear science, nonlinear state
surface diffusion » state diffusion
array formulas » area formulas, harrop formulas, array format
array arcing » array forming, array probing, array sharing
array string » array strong, arrays strings, array sharing

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: integration nonlinear surface diffusion ((((array arcing) or (array string))) or (array formulas))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: integration nonlinear surface diffusion ((((array arcing) OR (array string))) OR (array formulas)).
• Adding a wildcard symbol may retrieve word variants: integration nonlinear surface diffusion ((((array arcing) or (array string))) or (array formulas))*.