Perhaps you should try some spelling variations:
"code learning convolution algorithms" » "code learning evolution algorithm", "code learning solution algorithm", "how learning convolution algorithms"
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("code learning convolution algorithms") or ("modified multiobjective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("code learning convolution algorithms") OR ("modified multiobjective optimization algorithm")).
• Removing quotes may allow a broader search: (( code learning convolution algorithms ) or ( modified multiobjective optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("code learning convolution algorithms") or ("modified multiobjective optimization algorithm"))*.