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

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

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