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

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