Perhaps you should try some spelling variations:
"modified multiobjective approximation algorithms" » "modified multiobjective optimization algorithms"
"active learning emotion algorithm" » "active learning evolution algorithm", "active learning estimation algorithm", "active learning predation algorithm", "active learning method algorithm", "machine learning emotion 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: (("active learning emotion algorithm") OR ("modified multiobjective approximation algorithms"))~.
• Removing quotes may allow a broader search: (( active learning emotion algorithm ) or ( modified multiobjective approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("active learning emotion algorithm") or ("modified multiobjective approximation algorithms"))*.