Perhaps you should try some spelling variations:
"modified objective estimation algorithmss" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective estimation algorithms", "modified objective optimization algorithmss", "modified objective optimisation algorithms", "modified objective allocation algorithmss"
"modified robust estimation algorithms" » "modified robust estimation algorithm", "modified robust optimization algorithms", "modified robust optimisation algorithm", "modified pose estimation algorithms", "modified risk estimation algorithms"

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