Perhaps you should try some spelling variations:
"modified objective optimization algorithms" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective estimation algorithm", "modified multiobjective optimization algorithms"
"modified motion optimization algorithms" » "modified motion optimisation algorithm", "modified motion estimation algorithms", "modified motion estimation algorithm", "modified policy optimization algorithms", "modified allocation optimization algorithms"

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• Removing quotes may allow a broader search: (( modified objective optimization algorithms ) OR ( modified motion optimization algorithms ))~.
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