Perhaps you should try some spelling variations:
determination methods » examination methods, detection methods
array formulas » area formulas, harrop formulas, array format
array imaging » arrays imaging, airway imaging, ray imaging
array string » array strong, arrays strings, array sharing
position » positive

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

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