Perhaps you should try some spelling variations:
formulation optimisation » formulation optimization, reformulation optimization, simulation optimisation
optimisation method » optimization method, optimization methods
method roger » methods roger, method re, method rough
array arcing » array forming, array probing, array sharing
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: formulation optimisation method roger ((((array arcing) or (array format))) or (array string))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: formulation optimisation method roger ((((array arcing) OR (array format))) OR (array string)).
• Adding a wildcard symbol may retrieve word variants: formulation optimisation method roger ((((array arcing) or (array format))) or (array string))*.