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

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