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

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