Perhaps you should try some spelling variations:
surface diffusion » state diffusion
information gap » information guide
array probing » arrays probing, assay probing, array profiling
array string » array strong, arrays strings, array sharing
gap surface » egfp surface, tip surface, 1a surface
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 gap surface diffusion ((array string) or (((array using) or (array probing))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information gap surface diffusion ((array string) OR (((array using) OR (array probing)))).
• Adding a wildcard symbol may retrieve word variants: information gap surface diffusion ((array string) or (((array using) or (array probing))))*.