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