Perhaps you should try some spelling variations:
"modified robust optimization algorithm" » "modified robust optimization algorithms", "modified robust optimisation algorithm", "modified robust estimation algorithm"
"modified objective allocation algorithmic" » "modified objective location algorithmic", "modified objective allocation algorithms"

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