Perhaps you should try some spelling variations:
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"
"modified orca solution algorithms" » "modified orca solution algorithm", "modified orca evolution algorithm", "modified orca convolution algorithms", "modified norway solution algorithms", "modified drug solution algorithms", "modified nacl solution algorithms"

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