Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gaps » information gap, information games, information gain
gaps surface » gas surface, maps surface, glass surface
array strong » array sharing, norway strong, stay strong
array string » arrays strings, array sharing, array forming
arrays long » arrays ang, arrays load, array along

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