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