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