Perhaps you should try some spelling variations:
"modified parameter optimization algorithms" » "modified parameter optimisation algorithm", "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameters optimization algorithms"
"modified invasive estimation algorithmss" » "modified invasive estimation algorithms", "modified invasive estimation algorithm", "modified invasive ventilation algorithmss", "modified passive estimation algorithmss"

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 algorithmss") OR ("modified parameter optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified invasive estimation algorithmss ) or ( modified parameter optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified invasive estimation algorithmss") or ("modified parameter optimization algorithms"))*.