Perhaps you should try some spelling variations:
"modified passive estimation algorithmssss" » "modified passive estimation algorithms", "modified passive estimation algorithm", "modified pose estimation algorithmssss", "modified adaptive estimation algorithmssss"
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"

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• Removing quotes may allow a broader search: (( modified passive estimation algorithmssss ) OR ( modified objective optimization algorithm ))~.
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