Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
sphere optimization » sphere estimation, stage optimization, response 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 passive estimation algorithms ) OR ( modified sphere optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (( modified passive estimation algorithms ) or ( modified sphere optimization algorithms ))*.