Perhaps you should try some spelling variations:
stroke diffusion » state diffusion, stroke perfusion, stresses diffusion
information gis » information gain, information gaps, information grid
array sharing » arrays bearing, array imaging, way sharing
array probing » arrays probing, assay probing, array profiling
array string » array strong, arrays strings, array forming

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

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