Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"
"machines learning predation algorithm" » "machines learning predators algorithm", "machines learning estimation algorithm", "machines learning prediction algorithm", "machines learning emotion algorithm", "machine learning predation algorithm", "active learning predation algorithm", "mapping learning predation algorithm"

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: (("machines learning predation algorithm") or ("modified objective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("machines learning predation algorithm") OR ("modified objective optimization algorithm")).
• Removing quotes may allow a broader search: (( machines learning predation algorithm ) or ( modified objective optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("machines learning predation algorithm") or ("modified objective optimization algorithm"))*.