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