Perhaps you should try some spelling variations:
"modified notion optimization algorithms" » "modified notion optimisation algorithm", "modified notion estimation algorithm", "modified notion optimized algorithms", "modified network optimization algorithms", "modified policy optimization algorithms", "modified allocation optimization algorithms"
"modified orca estimation algorithms" » "modified orca estimation algorithm", "modified orca optimisation algorithm", "modified orca approximation algorithms", "modified dorca estimation algorithms", "modified orcad estimation algorithms", "modified ohca estimation algorithms"

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