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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified coverage approximation algorithms\") OR (\"modified adam solution algorithms\"))~".
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