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