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

Try widening your search to All Fields.

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 optimisation algorithmssssssss") or ("modified objective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df optimisation algorithmssssssss") OR ("modified objective optimization algorithm")).
• Removing quotes may allow a broader search: (( modified df optimisation algorithmssssssss ) or ( modified objective optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified df optimisation algorithmssssssss") or ("modified objective optimization algorithm"))*.