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

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