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