Perhaps you should try some spelling variations:
spaces extension » spaces extensions, states extension, surfaces extension
storage spaces » storage space, storage cases, storage ates
array formulas » area formulas, harrop formulas, array format
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 storage spaces extension ((((array formulas) or (array string))) or (array forming))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information storage spaces extension ((((array formulas) OR (array string))) OR (array forming)).
• Adding a wildcard symbol may retrieve word variants: information storage spaces extension ((((array formulas) or (array string))) or (array forming))*.