Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
robust estimation » robust optimization, pose estimation, risk estimation
pose optimisation » _ optimisation, pose estimation, game optimization
qoe optimization » game optimization, _ optimization, stage optimization

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( robust estimation algorithms ) or ( ((pose optimisation) or (qoe optimization)) algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( robust estimation algorithms ) OR ( ((pose optimisation) OR (qoe optimization)) algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( robust estimation algorithms ) or ( ((pose optimisation) or (qoe optimization)) algorithm ))*.