Perhaps you should try some spelling variations:
determination methods » examination methods, detection methods
array formats » array format, assay formats, array formulas
array forming » array format, array arcing, array fermi
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 formats))) or (array forming))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: position determination methods tools ((((array string) OR (array formats))) OR (array forming)).
• Adding a wildcard symbol may retrieve word variants: position determination methods tools ((((array string) or (array formats))) or (array forming))*.