Perhaps you should try some spelling variations:
estimation algorithmss » estimation algorithms, estimation algorithm, optimization algorithms
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
sphere estimation » pose estimation
qoe optimisation » qoe optimization, _ optimisation, game optimization

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( sphere estimation algorithmss ) or ( qoe optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( sphere estimation algorithmss ) OR ( qoe optimisation algorithm ))*.