Perhaps you should try some spelling variations:
"modified risk estimation algorithmss" » "modified risk estimation algorithms", "modified risk estimation algorithm", "modified risk optimization algorithms", "modified pose estimation algorithmss", "modified bi1 estimation algorithmss"
"modified objective approximation algorithms" » "modified objective approximation 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 risk estimation algorithmss\") OR (\"modified objective approximation algorithms\"))~".
• Removing quotes may allow a broader search: (( modified risk estimation algorithmss ) OR ( modified objective approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified risk estimation algorithmss") OR ("modified objective approximation algorithms"))*.