Perhaps you should try some spelling variations:
"modified parameters estimation algorithmss" » "modified parameters estimation algorithms", "modified parameters estimation algorithm", "modified parameters optimization algorithms", "modified parameter estimation algorithmss", "modified parameter estimates algorithmss", "modified parameter optimization algorithmss"
"modified objective predators algorithm" » "modified objective predation algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified parameters estimation algorithmss\") OR (\"modified objective predators algorithm\"))~".
• Removing quotes may allow a broader search: (( modified parameters estimation algorithmss ) OR ( modified objective predators algorithm ))~.
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