Perhaps you should try some spelling variations:
"modified df estimation algorithmssssssss" » "modified df estimation algorithms", "modified _ estimation algorithmssssssss", "modified adam estimation algorithmssssssss", "modified bi1 estimation algorithmssssssss"
"modified objective allocation algorithm" » "modified objective estimation algorithm", "modified objective evolution algorithm", "modified objective predation 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 df estimation algorithmssssssss") OR ("modified objective allocation algorithm"))~.
• Removing quotes may allow a broader search: (( modified df estimation algorithmssssssss ) or ( modified objective allocation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified df estimation algorithmssssssss") or ("modified objective allocation algorithm"))*.