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

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