Perhaps you should try some spelling variations:
"modified location optimisation algorithm" » "modified location optimization algorithms", "modified location estimation algorithm", "modified location estimation algorithms", "modified allocation optimization algorithm", "modified carbon optimisation algorithm"
"modified quantile approximation algorithms" » "modified time approximation algorithms", "modified diophantine approximation algorithms", "modified adaptive approximation algorithms"

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