Perhaps you should try some spelling variations:
"modified stochastic optimization algorithms" » "modified stochastic optimisation algorithm", "modified stochastic estimation algorithms", "modified stochastic estimation algorithm"
"modified orca predation algorithm" » "modified orca predators algorithm", "modified orca estimation algorithm", "modified dorca predation algorithm", "modified orcad predation algorithm", "modified ohca predation algorithm"

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