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
array formats » array format, assay formats, array formulas
gaps surface » gas surface, maps surface, glass surface
array string » array strong, arrays strings, 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 formats))) or (array profiling))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information gaps surface diffusion ((((array string) OR (array formats))) OR (array profiling)).
• Adding a wildcard symbol may retrieve word variants: information gaps surface diffusion ((((array string) or (array formats))) or (array profiling))*.