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

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