Perhaps you should try some spelling variations:
"modified objective allocation algorithm" » "modified objective estimation algorithm", "modified objective evolution algorithm", "modified objective predation algorithm"
"verified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"verified network approximation algorithms\") OR (\"modified objective allocation algorithm\"))~".
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