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

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

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