Perhaps you should try some spelling variations:
"modified network approximation algorithm" » "modified network approximation algorithms", "certified network approximation algorithm", "defined network approximation algorithm", "modified near approximation algorithm"
"modified notion optimized algorithms" » "modified notion optimized algorithm", "modified notion optimizer algorithms", "modified notion optimization algorithms"

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