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