Perhaps you should try some spelling variations:
estimation detection » estimation detecting, respiration detection, activation detection
array formulas » area formulas, harrop formulas, array format
arrays probing » array probing, rays probing, arrays producing
method tools » methods tools, method two
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: estimation detection method tools ((((array string) or (array formulas))) or (arrays probing))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: estimation detection method tools ((((array string) OR (array formulas))) OR (arrays probing)).
• Adding a wildcard symbol may retrieve word variants: estimation detection method tools ((((array string) or (array formulas))) or (arrays probing))*.