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