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