Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gap » information guide
array imaging » arrays imaging, airway imaging, ray imaging
array formats » array format, assay formats, array formulas
gap surface » egfp surface, tip surface, 1a surface

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: information gap surface diffusion ((array based) or (((array imaging) or (array formats))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information gap surface diffusion ((array based) OR (((array imaging) OR (array formats)))).
• Adding a wildcard symbol may retrieve word variants: information gap surface diffusion ((array based) or (((array imaging) or (array formats))))*.