Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
notion optimization » network optimization, policy optimization, allocation optimization
passive estimation » pose estimation
modified passive » modified adaptive

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 notion optimization algorithms ) OR ( modified passive estimation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified notion optimization algorithms ) or ( modified passive estimation algorithms ))*.