Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified total estimation algorithm" » "modified motion estimation algorithm", "modified pose estimation algorithm", "modified total variation algorithm", "modified thermal estimation algorithm", "modified ti6al4v estimation algorithm"

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