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