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

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