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