Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified carbon aided algorithm" » "modified carbon adam algorithm", "modified carbon driven algorithm", "modified carbon winner algorithm", "modified carbon fiber algorithm", "modified carbon based algorithm", "modified carbon yield algorithm"

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