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