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