Perhaps you should try some spelling variations:
"modified optimal estimation algorithmss" » "modified optimal estimation algorithm", "modified optimal optimization algorithms", "modified optimal estimation algorithms", "modified optimal optimization algorithmss", "modified optimal optimisation algorithms", "modified optimal taxation algorithmss", "modified thermal estimation algorithmss"
"modified objective estimation algorithms" » "modified objective estimation algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective allocation algorithms"

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