Perhaps you should try some spelling variations:
information ground » information grounds, information group, information grid
source diffusion » resource diffusion, surface diffusion, double diffusion
ground source » sound source, ground surface, sound sources
array forming » array arcing, array fermi, array formats
array string » array strong, arrays strings, array sharing

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

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