Perhaps you should try some spelling variations:
objective optimization » multiobjective optimization
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
estimation algorithmss » estimation algorithms, estimation algorithm, optimization algorithms
modified quantile » modified adaptive

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified objective optimization algorithm ) OR ( modified quantile estimation algorithmss ))~".
• Adding a wildcard symbol may retrieve word variants: (( modified objective optimization algorithm ) OR ( modified quantile estimation algorithmss ))*.