Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gaps » information gap, information games, information gain
array processing » dairy processing, query processing
gaps surface » gas surface, maps surface, glass surface
array using » arrays using
array fermi » array forming, array format

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

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