Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified over estimation algorithm" » "modified cover estimations algorithm", "modified pose estimation algorithm", "modified sphere estimation algorithm", "modified near estimation algorithm", "modified orca estimation algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified over estimation algorithm") OR ("modified notion approximation algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified over estimation algorithm\") OR (\"modified notion approximation algorithms\"))*".
• Removing quotes may allow a broader search: (( modified over estimation algorithm ) OR ( modified notion approximation algorithms ))*.