Perhaps you should try some spelling variations:
"modified objective optimization algorithmsss" » "modified objective optimisation algorithm", "modified objective estimation algorithms", "modified objective optimisation algorithmss", "modified objective estimation algorithmsss", "modified objective estimation algorithmss", "modified multiobjective optimization algorithmsss"
"modified robust optimization algorithms" » "modified robust optimisation algorithm", "modified robust estimation algorithms", "modified robust estimation algorithm"

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