Perhaps you should try some spelling variations:
"modified notion optimisation algorithmss" » "modified notion optimisation algorithm", "modified notion optimization algorithms", "modified notion estimation algorithms", "modified network optimization algorithmss"
"modified stochastic optimization algorithm" » "modified stochastic optimization algorithms", "modified stochastic optimisation algorithm", "modified stochastic estimation algorithm"

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