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

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