Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gaps » information gap, information games, information gain
array imaging » arrays imaging, airway imaging, ray imaging
gaps surface » gas surface, maps surface, glass surface
array string » array strong, arrays strings, array sharing
array paving » array planning, array probing, 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 gaps surface diffusion ((array string) OR (((array paving) OR (array imaging))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "information gaps surface diffusion ((array string) OR (((array paving) OR (array imaging))))".
• Adding a wildcard symbol may retrieve word variants: information gaps surface diffusion ((array string) OR (((array paving) OR (array imaging))))*.