Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
optimization algorithm » optimisation algorithm, estimation algorithm, estimation algorithms
sphere optimization » sphere estimation, stage optimization, response optimization
game optimization » stage optimization, qoe optimization, market 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 optimization algorithms ) or ( game optimization algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( sphere optimization algorithms ) OR ( game optimization algorithm ))*.