Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information grid » information guide, information gain, information gis
grid surface » arid surface, gold surface, ground surface
array string » array strong, arrays strings, array sharing
array paving » array planning, array imaging, array probing

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

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