Perhaps you should try some spelling variations:
information grain » information gain, information train, information grace
surface diffusion » state diffusion
grain surface » brain surface, rain surface, grating surface
array string » arrays strings, array sharing, array forming
array strong » array sharing, norway strong, stay strong

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

• Performing a fuzzy search may retrieve terms with similar spellings: information grain surface diffusion ((((array string) OR (array strong))) or (array format))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information grain surface diffusion ((((array string) OR (array strong))) OR (array format)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "information grain surface diffusion ((((array string) OR (array strong))) or (array format))".
• Adding a wildcard symbol may retrieve word variants: information grain surface diffusion ((((array string) OR (array strong))) or (array format))*.