Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"mapping learning solution algorithm" » "mapping learning evolution algorithm", "mapping learning convolution algorithms", "mapping learning evolutionary algorithm", "mapping learning convolution algorithm", "mapping learning emotion algorithm", "machine learning solution algorithm", "enabling learning solution 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 algorithm") OR ("mapping learning solution algorithm"))~.
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) or ( mapping learning solution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithm") or ("mapping learning solution algorithm"))*.