Perhaps you should try some spelling variations:
source diffusion » resource diffusion, surface diffusion, double diffusion
information gis » information gain, information gaps, information grid
array formats » array format, assay formats, array formulas
array string » array strong, arrays strings, array sharing
array arcing » array forming, array probing, array sharing
gis source » gas source, gras source, nirs source

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

• If you are trying to use Boolean operators, they must be ALL CAPS: information gis source diffusion ((array string) OR (((array formats) OR (array arcing))))~.
• Adding a wildcard symbol may retrieve word variants: information gis source diffusion ((array string) or (((array formats) or (array arcing))))*.