Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information sets » information set, information setc, information sheets
array processing » dairy processing, query processing
sets surface » sers surface, its surface, e's surface
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: information sets surface diffusion ((array arcing) or (((array string) or (array processing))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information sets surface diffusion ((array arcing) OR (((array string) OR (array processing)))).
• Adding a wildcard symbol may retrieve word variants: information sets surface diffusion ((array arcing) or (((array string) or (array processing))))*.