Perhaps you should try some spelling variations:
"machinery counting methods algorithm" » "machinery using methods algorithm", "machinery nursing methods algorithm", "machinery control methods algorithm"
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near approximation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"machinery counting methods algorithm\") OR (\"modified network approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( machinery counting methods algorithm ) OR ( modified network approximation algorithms ))~.
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