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

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: (("modified sphere optimization algorithms") OR ("modified allocation optimisation algorithm"))~.
• Removing quotes may allow a broader search: (( modified sphere optimization algorithms ) or ( modified allocation optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified sphere optimization algorithms") or ("modified allocation optimisation algorithm"))*.