Perhaps you should try some spelling variations:
information theme » information time, information theory, information tools
surface diffusion » state diffusion
array processing » dairy processing, query processing
theme surface » thermal surface, theory surface, sphere surface
array forming » array format, array arcing, array fermi
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 theme surface diffusion ((array string) or (((array forming) or (array processing))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information theme surface diffusion ((array string) OR (((array forming) OR (array processing)))).
• Adding a wildcard symbol may retrieve word variants: information theme surface diffusion ((array string) or (((array forming) or (array processing))))*.