Perhaps you should try some spelling variations:
"modified sphere optimization algorithms" » "modified sphere optimisation algorithm", "modified sphere estimation algorithms", "modified sphere estimation algorithm", "modified sphere optimisation algorithms", "modified sphere estimation algorithmss", "modified stage optimization algorithms", "modified response optimization algorithms"
"modified parameter optimization algorithm" » "modified parameter optimisation algorithm", "modified parameter estimation algorithm", "modified parameter estimation algorithms", "modified parameters optimization algorithm"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified sphere optimization algorithms") OR ("modified parameter optimization algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified sphere optimization algorithms\") OR (\"modified parameter optimization algorithm\"))".
• Removing quotes may allow a broader search: (( modified sphere optimization algorithms ) OR ( modified parameter optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified sphere optimization algorithms") OR ("modified parameter optimization algorithm"))*.