Perhaps you should try some spelling variations:
optimisation algorithmss » optimisation algorithm, optimization algorithms, estimation algorithms
allocation optimisation » allocation optimization
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
parameter » parameters

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