Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithms" » "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithms", "modified multiobjective optimized algorithms"
"code learning estimation algorithm" » "code learning emotion algorithm", "code lighting estimation algorithm", "how learning 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 estimation algorithm") or ("modified multiobjective optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("code learning estimation algorithm") OR ("modified multiobjective optimization algorithms")).
• Removing quotes may allow a broader search: (( code learning estimation algorithm ) or ( modified multiobjective optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("code learning estimation algorithm") or ("modified multiobjective optimization algorithms"))*.