Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified objective predators algorithms" » "modified objective predators algorithm", "modified objective predation 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 predators algorithms") or ("modified multiobjective estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective predators algorithms") OR ("modified multiobjective estimation algorithms"))*.
• Removing quotes may allow a broader search: (( modified objective predators algorithms ) or ( modified multiobjective estimation algorithms ))*.