Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"designed network optimizer algorithms" » "designed network optimized algorithms", "designed network optimized algorithm", "designed network optimization algorithms", "defined network optimizer algorithms"

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: (("designed network optimizer algorithms") OR ("modified multiobjective estimation algorithm"))~.
• Removing quotes may allow a broader search: (( designed network optimizer algorithms ) or ( modified multiobjective estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("designed network optimizer algorithms") or ("modified multiobjective estimation algorithm"))*.