Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, estimation algorithm, optimized algorithm
optimisation algorithm » optimization algorithms, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
sphere optimisation » sphere estimation

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 optimisation algorithm ) OR ( _ ((optimization algorithm) OR (estimation algorithms)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( sphere optimisation algorithm ) or ( _ ((optimization algorithm) OR (estimation algorithms)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( sphere optimisation algorithm ) or ( _ ((optimization algorithm) OR (estimation algorithms)) ))*.