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