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