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 strong » array string, array sharing, norway strong
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 strong) or (((array paving) or (array imaging))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information gaps surface diffusion ((array strong) OR (((array paving) OR (array imaging)))).
• Adding a wildcard symbol may retrieve word variants: information gaps surface diffusion ((array strong) or (((array paving) or (array imaging))))*.