Perhaps you should try some spelling variations:
"modified allocation optimisation algorithm" » "modified allocation optimization algorithm", "modified allocation estimation algorithm", "modified allocation estimation algorithms"
"modified sphere optimization algorithms" » "modified sphere estimation algorithms", "modified sphere estimation algorithm", "modified sphere optimized algorithms", "modified stage optimization algorithms", "modified response optimization 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 allocation optimisation algorithm") OR ("modified sphere optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified allocation optimisation algorithm ) or ( modified sphere optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified allocation optimisation algorithm") or ("modified sphere optimization algorithms"))*.