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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified df optimization algorithmssssss") or ("modified objective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df optimization algorithmssssss") OR ("modified objective optimization algorithms")).
• Removing quotes may allow a broader search: (( modified df optimization algorithmssssss ) or ( modified objective optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified df optimization algorithmssssss") or ("modified objective optimization algorithms"))*.