Perhaps you should try some spelling variations:
"modified orca optimisation algorithm" » "modified orca optimization algorithms", "modified orca estimation algorithm", "modified orca estimation algorithms", "modified _ optimisation algorithm"
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective estimation algorithm", "modified objective estimation algorithms"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified orca optimisation algorithm") or ("modified objective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified orca optimisation algorithm") OR ("modified objective optimization algorithm")).
• Removing quotes may allow a broader search: (( modified orca optimisation algorithm ) or ( modified objective optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified orca optimisation algorithm") or ("modified objective optimization algorithm"))*.