Perhaps you should try some spelling variations:
subsurface diffusion » surface diffusion, surfaces diffusion, subsurface pollution
information group » informatics group, informative group, information grounds
group subsurface » ground subsurface, from subsurface, deep subsurface
array string » array strong, arrays strings, array sharing
array along » arrays long, array arcing, array paving
array using » arrays using

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 group subsurface diffusion ((array string) OR (((array along) OR (array using))))~.
• Adding a wildcard symbol may retrieve word variants: information group subsurface diffusion ((array string) or (((array along) or (array using))))*.