Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified df optimized algorithms" » "modified df optimized algorithm", "modified df optimizer algorithms", "modified _ optimized algorithms", "modified _ optimize algorithms", "modified adam optimized algorithms", "modified bi1 optimized 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 optimized algorithms") or ("modified multiobjective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified df optimized algorithms") OR ("modified multiobjective optimization algorithms")).
• Removing quotes may allow a broader search: (( modified df optimized algorithms ) or ( modified multiobjective optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified df optimized algorithms") or ("modified multiobjective optimization algorithms"))*.