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 static optimisation algorithm" » "modified static optimization algorithms", "modified static estimation algorithm", "modified static estimation algorithms", "modified static optimization algorithm", "modified stage optimization algorithm", "modified stochastic optimization algorithm"

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