Perhaps you should try some spelling variations:
"modified notion optimisation algorithm" » "modified notion optimization algorithms", "modified notion estimation algorithm", "modified network optimization algorithm"
"modified made estimation algorithms" » "modified made estimation algorithm", "modified made optimization algorithms", "modified made approximation algorithms", "modified pose estimation algorithms", "modified male estimation algorithms", "modified adam estimation algorithms", "modified df estimation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified notion optimisation algorithm\") OR (\"modified made estimation algorithms\"))~".
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