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