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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified caging optimisation algorithms") OR ("modified parameters optimisation algorithm"))*.
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