Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithmss" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified df optimisation algorithm" » "modified df optimization algorithms", "modified df estimation algorithm", "modified df estimation algorithms", "modified _ optimisation algorithm", "modified _ optimization algorithm", "modified qoe optimization algorithm", "modified adam optimisation algorithm", "modified bi1 optimisation 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 df optimisation algorithm") OR ("modified multiobjective optimization algorithmss"))~.
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