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

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective optimization algorithm\") OR (\"modified df estimation algorithmssssss\"))~".
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) OR ( modified df estimation algorithmssssss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithm") OR ("modified df estimation algorithmssssss"))*.