Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified stochastic solution algorithm" » "modified stochastic evolution algorithm", "modified stochastic convolution algorithms", "modified stochastic evolutionary algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified stochastic solution algorithm") OR ("modified multiobjective estimation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified stochastic solution algorithm\") OR (\"modified multiobjective estimation algorithms\"))*".
• Removing quotes may allow a broader search: (( modified stochastic solution algorithm ) OR ( modified multiobjective estimation algorithms ))*.