Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified nodal solution algorithms" » "modified nodal solution algorithm", "modified nodal evolution algorithm", "modified nodal convolution algorithms", "modified adam solution algorithms", "modified near solution algorithms", "modified model solutions algorithms", "modified norway solution algorithms", "modified nacl solution algorithms"

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