Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"modified passive optimized algorithms" » "modified passive optimized algorithm", "modified passive optimizer algorithms", "modified adaptive optimized algorithms"

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 passive optimized algorithms") OR ("modified multiobjective optimization algorithms"))~.
• Removing quotes may allow a broader search: (( modified passive optimized algorithms ) or ( modified multiobjective optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified passive optimized algorithms") or ("modified multiobjective optimization algorithms"))*.