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