Perhaps you should try some spelling variations:
spatial expression » spatial expressive, facial expression, spatial regression
information about » information age, information a
about spatial » about special, about social, robot spatial
array imaging » arrays imaging, airway imaging, ray imaging
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 about spatial expression ((((array string) or (array imaging))) or (array format))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information about spatial expression ((((array string) OR (array imaging))) OR (array format)).
• Adding a wildcard symbol may retrieve word variants: information about spatial expression ((((array string) or (array imaging))) or (array format))*.