Perhaps you should try some spelling variations:
estimation algorithms » estimation algorithm, optimization algorithms, optimisation algorithm
pose optimisation » _ optimisation, pose estimation, game optimization
sphere estimation » pose estimation
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: (( ((pose optimisation) OR (qoe optimization)) algorithm ) or ( sphere estimation algorithms ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((pose optimisation) OR (qoe optimization)) algorithm ) OR ( sphere estimation algorithms )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((pose optimisation) OR (qoe optimization)) algorithm ) or ( sphere estimation algorithms ))".
• Adding a wildcard symbol may retrieve word variants: (( ((pose optimisation) OR (qoe optimization)) algorithm ) or ( sphere estimation algorithms ))*.