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