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