Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective estimation algorithm"
"mapping learning evolution algorithm" » "mapping learning solution algorithm", "mapping learning evolutionary algorithm", "mapping learning convolution algorithms", "mapping learning convolution algorithm", "mapping learning emotion algorithm", "machine learning evolution algorithm", "enabling learning evolution algorithm"

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