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