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