Perhaps you should try some spelling variations:
optimisation algorithms » optimisation algorithm, optimization algorithms, estimation algorithms
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
sphere optimisation » sphere estimation
market optimization » game optimization, parameter optimization, market capitalization

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