Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
optimization algorithm » optimisation algorithm, estimation algorithm, estimation algorithms
nodal optimization » global optimization, qoe optimization
modified nodal » modified adam, modified near

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