Perhaps you should try some spelling variations:
"active learning method algorithm" » "active learning mom algorithm", "machine learning method algorithm", "active learning methods algorithm", "active graining methods algorithm", "active learning emotion algorithm"
"modified network approximation algorithms" » "certified network approximation algorithms", "defined network approximation algorithms", "modified near approximation algorithms"

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 method algorithm") OR ("modified network approximation algorithms"))~.
• Removing quotes may allow a broader search: (( active learning method algorithm ) or ( modified network approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("active learning method algorithm") or ("modified network approximation algorithms"))*.