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