Perhaps you should try some spelling variations:
estimations algorithms » estimation algorithms, estimation algorithm, optimization algorithms
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
sphere estimations » sphere estimation, cover estimations
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: (( sphere estimations algorithms ) or ( qoe optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( sphere estimations algorithms ) OR ( qoe optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (( sphere estimations algorithms ) or ( qoe optimization algorithm ))*.