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 total predation algorithm" » "modified total predators algorithm", "modified total estimation algorithm", "modified thermal predation algorithm", "modified ti6al4v predation 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 objective optimization algorithm") OR ("modified total predation algorithm"))~.
• Removing quotes may allow a broader search: (( modified objective optimization algorithm ) or ( modified total predation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified objective optimization algorithm") or ("modified total predation algorithm"))*.