Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm
estimation algorithms » estimation algorithm, optimization algorithms, approximation algorithms
same optimisation » game optimization, stage optimization, _ optimisation
post estimation » pose estimation, risk estimation, pulses 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: (( post estimation algorithms ) OR ( same optimisation algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (( post estimation algorithms ) or ( same optimisation algorithm ))*.