Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified robust estimation algorithmsss" » "modified robust estimation algorithms", "modified robust optimization algorithmsss", "modified pose estimation algorithmsss", "modified risk estimation algorithmsss"

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 estimation algorithm") OR ("modified robust estimation algorithmsss"))~.
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithm ) or ( modified robust estimation algorithmsss ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective estimation algorithm") or ("modified robust estimation algorithmsss"))*.