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