Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified optimal estimation algorithmss" » "modified optimal estimation algorithms", "modified optimal optimization algorithms", "modified optimal taxation algorithmss", "modified thermal estimation algorithmss"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified optimal estimation algorithmss") or ("modified multiobjective estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified optimal estimation algorithmss") OR ("modified multiobjective estimation algorithm")).
• Removing quotes may allow a broader search: (( modified optimal estimation algorithmss ) or ( modified multiobjective estimation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified optimal estimation algorithmss") or ("modified multiobjective estimation algorithm"))*.