Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified pulse estimation algorithm" » "modified pulses estimation algorithm", "modified pose estimation algorithm", "modified sphere estimation algorithm", "modified male estimation algorithm", "modified passive estimation algorithm"

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