Perhaps you should try some spelling variations:
objective optimisation » objective optimization, multiobjective optimization
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
predation algorithm » predators algorithm, estimation algorithm
ohca predation » orca predation
modified ohca » modified orca

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

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