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

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