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 estimation algorithms" » "modified a estimation algorithm", "modified a optimization algorithms", "modified a optimisation algorithm", "modified _ estimation algorithms", "modified a destination algorithms", "modified _ estimating algorithms", "modified df estimation algorithms", "modified adam estimation algorithms"

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