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"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified a validation algorithm\") OR (\"modified adamverage approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified a validation algorithm ) OR ( modified adamverage approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified a validation algorithm") OR ("modified adamverage approximation algorithms"))*.