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