Perhaps you should try some spelling variations:
"modified multiobjective optimizer algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective optimized algorithms", "modified multiobjective optimized algorithm"
"enabling learning methods algorithm" » "mapping learning methods algorithm", "enabling nursing methods algorithm"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimizer algorithms") OR ("enabling learning methods algorithm"))~.
• Removing quotes may allow a broader search: (( modified multiobjective optimizer algorithms ) or ( enabling learning methods algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified multiobjective optimizer algorithms") or ("enabling learning methods algorithm"))*.