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