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 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective optimization algorithm\") OR (\"mapping learning evolution algorithm\"))~".
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithm ) OR ( mapping learning evolution algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimization algorithm") OR ("mapping learning evolution algorithm"))*.