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