Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
modified network » certified network, defined network, modified near
active learning » machine learning
a algorithm » _ algorithm, _ algorithms, adam algorithm
learning a » learning _

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( active learning a algorithm ) or ( modified network optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( active learning a algorithm ) OR ( modified network optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( active learning a algorithm ) or ( modified network optimization algorithm ))*.