Perhaps you should try some spelling variations:
"modified objective approximation algorithm" » "modified objective approximation algorithms"
"modified risk estimation algorithmss" » "modified risk estimation algorithms", "modified risk estimation algorithm", "modified risk optimization algorithms", "modified pose estimation algorithmss", "modified bi1 estimation algorithmss"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified risk estimation algorithmss") OR ("modified objective approximation algorithm"))~.
• Removing quotes may allow a broader search: (( modified risk estimation algorithmss ) or ( modified objective approximation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified risk estimation algorithmss") or ("modified objective approximation algorithm"))*.