Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information rain » information train, information gain, information radio
array probing » arrays probing, assay probing, array profiling
rain surface » brain surface, skin surface, facing surface
array string » array strong, arrays strings, array sharing
array using » arrays using

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: information rain surface diffusion ((array using) OR (((array string) OR (array probing))))~.
• Adding a wildcard symbol may retrieve word variants: information rain surface diffusion ((array using) or (((array string) or (array probing))))*.