Perhaps you should try some spelling variations:
special expression » spatial expression, species expression, specific expression
information a » information age
array formats » array format, assay formats, array formulas
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 a special expression ((array string) or (((array formats) or (array imaging))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information a special expression ((array string) OR (((array formats) OR (array imaging)))).
• Adding a wildcard symbol may retrieve word variants: information a special expression ((array string) or (((array formats) or (array imaging))))*.