Perhaps you should try some spelling variations:
"modified caging optimisation algorithms" » "modified caging optimisation algorithm", "modified caging optimization algorithms", "modified caging estimation algorithms", "modified staffing optimization algorithms"
"modified parameter estimation algorithm" » "modified parameter estimates algorithm", "modified parameter optimization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified caging optimisation algorithms\") OR (\"modified parameter estimation algorithm\"))~".
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