Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified aging optimization algorithmss" » "modified aging optimization algorithms", "modified aging optimisation algorithm", "modified aging estimation algorithms", "modified staffing optimization algorithmss", "modified game optimization algorithmss", "modified caging optimization algorithmss"

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 aging optimization algorithmss") OR ("modified multiobjective estimation algorithm"))~.
• Removing quotes may allow a broader search: (( modified aging optimization algorithmss ) or ( modified multiobjective estimation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified aging optimization algorithmss") or ("modified multiobjective estimation algorithm"))*.