Perhaps you should try some spelling variations:
information sets » information set, information setc, information sheets
array processing » dairy processing, query processing
two dimensional » three dimensional
array formulas » area formulas, harrop formulas, array format
array string » array strong, arrays strings, array sharing
sets two » assets two, tests two, texts two

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: information sets two dimensional ((((array processing) or (array formulas))) or (array string))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information sets two dimensional ((((array processing) OR (array formulas))) OR (array string)).
• Adding a wildcard symbol may retrieve word variants: information sets two dimensional ((((array processing) or (array formulas))) or (array string))*.