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
market estimation » market optimization, parameter estimation

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

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