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