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