Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
predation algorithm » predators algorithm, estimation algorithm
model predation » model reduction, model predictive, model predicting
modified model » modified male
parameter » parameters

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