Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
sphere estimation » pose estimation
qoe optimization » game optimization, _ optimization, stage optimization

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