Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm", "modified multiobjective optimized algorithms"
"modified pose estimation algorithms" » "modified pose estimation algorithm", "modified pose optimisation algorithm", "modified pose approximation algorithms", "modified male estimation algorithms", "modified passive estimation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithms") OR ("modified pose estimation algorithms")).
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