Perhaps you should try some spelling variations:
"modified adamverage approximation algorithms" » "modified average approximation algorithms", "modified _damverage approximation algorithms", "modified dfdamverage approximation algorithms", "modified adamdamverage approximation algorithms"
"modified a validation algorithm" » "modified a estimation algorithm", "modified a predation algorithm", "modified a estimation algorithms", "modified _ validation algorithm", "modified a valuation algorithm", "modified _ validating algorithm", "modified df validation algorithm", "modified adam validation algorithm"

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