Perhaps you should try some spelling variations:
"modified df evolutionary algorithm" » "modified df evolution algorithm", "modified df solution algorithm", "modified _ evolutionary algorithm", "modified adam evolutionary algorithm", "modified bi1 evolutionary algorithm"
"modified dfverage approximation algorithms" » "modified average approximation algorithms", "modified _verage approximation algorithms", "modified adamverage approximation algorithms", "modified bi1verage approximation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified df evolutionary algorithm") OR ("modified dfverage approximation algorithms"))~.
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