Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"defined network optimizer algorithms" » "defined network optimized algorithms", "defined network optimized algorithm", "defined network optimization algorithms", "designed 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: (("defined network optimizer algorithms") OR ("modified multiobjective estimation algorithm"))~.
• Removing quotes may allow a broader search: (( defined network optimizer algorithms ) or ( modified multiobjective estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("defined network optimizer algorithms") or ("modified multiobjective estimation algorithm"))*.