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 probing » arrays probing, assay probing, array profiling
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 probing) or (array string))) or (array formulas))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information storage spaces extension ((((array probing) OR (array string))) OR (array formulas)).
• Adding a wildcard symbol may retrieve word variants: information storage spaces extension ((((array probing) or (array string))) or (array formulas))*.