Perhaps you should try some spelling variations:
formulation development » communication development, education development, organization development
development class » development case, development cases, development close
class divisions » class dimensions, class missions, class discussions
array probing » arrays probing, assay probing, array profiling
array using » arrays using
arrays ang » arrays a

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

• If you are trying to use Boolean operators, they must be ALL CAPS: formulation development class divisions ((((array using) OR (arrays ang))) OR (array probing))~.
• Adding a wildcard symbol may retrieve word variants: formulation development class divisions ((((array using) or (arrays ang))) or (array probing))*.