Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified df estimation algorithmsss" » "modified df estimation algorithms", "modified _ estimation algorithmsss", "modified adam estimation algorithmsss", "modified bi1 estimation algorithmsss"

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 multiobjective estimation algorithm") OR ("modified df estimation algorithmsss"))~.
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithm ) or ( modified df estimation algorithmsss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective estimation algorithm") or ("modified df estimation algorithmsss"))*.