Perhaps you should try some spelling variations:
"modified multiobjective optimizer algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective optimized algorithms", "modified multiobjective optimized algorithm"
"mapping learning predators algorithm" » "mapping learning predation algorithm", "mapping marine predators algorithm", "machine learning predators algorithm", "enabling learning predators 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 multiobjective optimizer algorithms") OR ("mapping learning predators algorithm"))~.
• Removing quotes may allow a broader search: (( modified multiobjective optimizer algorithms ) or ( mapping learning predators algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimizer algorithms") or ("mapping learning predators algorithm"))*.