Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified sphere estimation algorithmss" » "modified sphere estimation algorithms", "modified sphere estimation algorithm", "modified pose 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 sphere estimation algorithmss") or ("modified multiobjective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified sphere estimation algorithmss") OR ("modified multiobjective optimization algorithms")).
• Removing quotes may allow a broader search: (( modified sphere estimation algorithmss ) or ( modified multiobjective optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("modified sphere estimation algorithmss") or ("modified multiobjective optimization algorithms"))*.