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