Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gaps » information gap, information games, information gain
array profiling » array processing, microarray profiling
gaps surface » gas surface, maps surface, glass surface
array along » arrays long, array arcing, array paving
array using » arrays using

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