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